Newcastle clung on to their place in Gallagher Premiership for at least another day after Leicester fell to an ugly 23-19 defeat by Harlequins at the Stoop.
The Tigers needed two points from the penultimate round of the regular season to condemn Newcastle to relegation but fell short on a hard-fought evening in south west London.
Victory over Gloucester on Saturday will allow the Falcons to survive until the final weekend when they host Bristol, but they would still remain overwhelming favourites to go down.
Harlequins replaced Northampton in fourth to lift their hopes of securing a semi-final, in the process ending their five-match losing run in the Premiership.
Flanker Alex Dombrandt was a constant threat in the carry, prop Kyle Sinckler rampaged around the pitch and scrum-half Danny Care marked his return from a hamstring injury with a lively display, but it was an evening of few highlights.
Replacement lock Semi Kunatani delivered the knockout blow seven minutes from time when he scooped the ball from a ruck and galloped through a gigantic hole to finish under the posts.
All of Leicester's points were delivered by the boot of George Ford until Mike Fitzgerald drove over three minutes into overtime, securing a bonus point that could yet be critical in condemning Newcastle to relegation.
Former Australia captain James Horwill led out Quins in his final home appearance before retiring at the end of the season and his team were quickly into their stride though a piercing attack launched by Mike Brown.
It took six minutes for the first try to come, strong carries from Dombrandt and Horwill at a line-out creating the chance for Care to cross from close range.
Two penalties by Ford kept Leicester in touch and a period of dominance followed as Quins spent increasingly lengthy spells defending in their own 22.
For all their possession, the Tigers could not breach the try-line but as half-time approached their prospects improved when opposition number eight Jack Clifford was sent to the sin-bin for a dangerous tackle on full-back Telusa Veainu.
Back chat from Quins cost another 10 metres and although the home side rallied superbly at a threatening line-out, Leicester's assault continued with waves of attacks forcing a penalty that was landed by Ford.
Veainu departed for a head injury assessment a full two minutes after he had been flattened by Clifford, but he passed the test.
A stilted start to the second half produced few thrills but a pair of Smith penalties propelled Quins back in front and Leicester's chances faded when Dan Cole conceded a penalty just as his side were building a head of steam.
The visitors lacked cohesion and their lack of threat was summed up when Ford sent an attacking kick straight into touch.
And typically they were at fault for the try that finished them off as they left a ruck unguarded, allowing Fijian giant Kunatani to touch down.
The last word was had by Leicester, however, as replacement second row Fitzgerald used his bulky frame to force his way over and secure the losing bonus point.
Bristol 20-20 Bath
Ian Madigan and Faf De Klerk both missed penalties in the dying minutes as Bristol and Sale Sharks fought out a gripping 20-20 draw at Ashton Gate.
Bristol substitute Madigan failed to find the target with two long-range efforts, while Sale scrum-half De Klerk hit the post with just seconds remaining.
Sale's Gallagher Premiership play-off hopes will be over if Northampton claim a bonus-point victory over Worcester on Saturday, although Champions Cup qualification remains a strong possibility.
Tries by wing Denny Solomona and De Klerk edged Sale ahead in front of a 20,000 crowd, while De Klerk added a penalty and his half-back partner AJ MacGinty kicked two conversions and a penalty.
The result effectively ended Bristol's hopes of a top-six finish, even though they went close, matching Sale on tries through touchdowns by full-back Charles Piutau and Alapati Leiua, while fly-half Callum Sheedy kicked seven points.
Former New Zealand full-back Piutau returned after recovering from a calf injury for Bristol, and his brother Siale Piutau featured in midfield, replacing an injured Sam Bedlow.
Sale, meanwhile, were forced into a reshuffle with centre James O'Connor sidelined after suffering a neck injury during the warm-up.
Luke James moved from full-back to centre, Chris Ashton wore the number 15 shirt and Aaron Reed started in Ashton's familiar left-wing position.
Despite the late disruption, Sale made a strong start and they went ahead after 10 minutes through an interception try.
Sheedy tried to move possession wide just inside Sale's half, but the ball went straight to Solomona, who sprinted 60 metres unopposed, with MacGinty converting for a 7-0 lead.
MacGinty kicked a penalty to increase Sale's advantage, and Bristol could only reflect on a poor opening quarter that saw frequently poor tactical kicking and wrong options in attack.
Bristol needed a response, and it arrived 10 minutes before half-time following relentless pressure by their forwards from two attacking lineouts after the home side sacrificed kicks at goal.
And their sense of adventure was rewarded as they finally exploited a gap in Sale's well-organised defence, with Piutau touching down for a try that Sheedy converted.
De Klerk's long-range strike gave Sale some breathing space again, but a Sheedy penalty cancelled that out just before the break and Sale led 13-10.
The visitors took less than two minutes of the second half to breach Bristol's defence, breaking them open through flanker Ben Curry's powerful run, before his inside pass found De Klerk, who finished impressively.
MacGinty converted from the touchline, yet Bristol hit back from their next attack, stretching Sale wide before Leiua squeezed over in the corner.
Referee Matt Carley required confirmation from the television match official before awarding it, and then Sheedy landed a touchline conversion to make it a three-point game once more.
Bristol thought they had gone ahead 12 minutes from time thanks to a brilliant solo effort by Leiua, but referee Matt Carley disallowed it following a tussle between Sheedy and Ashton during the build-up.
Ashton initiated contact with the Bristol player, who then pulled Ashton's shirt over his head as Leiua sprinted clear unopposed.
Another Sheedy penalty tied the game up with nine minutes left, but Madigan was then twice off target as Sale finished the game with 14 men after their skipper Jono Ross was sin-binned for a dangerous clear-out at a ruck.
And then De Klerk had his match-winning chance, but his penalty hit the post during a frenzied finale.