Leeds missed the chance to move off the bottom of the Aviva Premiership table on Sunday, falling to a dismal 38-3 defeat against Harlequins.
Danny Care was the inspiration against his former charges, doing his old club no favours as Neil Back's men slid ever closer to relegation.
Care claimed his side's first try in the minute and hooker Joe Gray added a second minutes later as Quins established a comfortable 14-0 lead.
Second-half scores from Jordan Turner-Hall, Nick Easter and Mike Brown rubbed salt in Leeds' wounds and boosted Quins' of qualifying for next season's Heineken Cup.
Leeds remain bottom of the table with only match remaining - away to Northampton on May 7 - and level on points with Newcastle Falcons. However, Newcastle have a superior points difference and also have two matches remaining, leaving Leeds as overwhelming favourite for the drop.
Care capped Quins' early dominance when he collected his own chip to touch down in the 18th minute for a fine individual score.
Nick Evans converted and three minutes later a flowing move led to hooker Joe Gray going over and Evans again added the extras.
Leeds fly-half Adrian Jarvis missed two first-half penalties and three minutes after the restart Turner-Hall went over after good work from Care and Gonzalo Camacho.
A penalty from Christian Lewis-Pratt got Leeds off the mark in the 51st minute but then saw another attempt rebound off a post moments later.
Care added a drop goal on the hour and then Easter went over two minutes later for a converted try which secured the bonus point. Full-back Brown ran in a late fifth which Rory Clegg converted.
For Leeds Carnegie:
Tries: Care, Gray, Turner-Hall, Easter, Brown
Con: Evans 4, Clegg
Leeds Carnegie: 15 Christian Lewis-Pratt, 14 Lee Blackett, 13 Henry Fa'afili, 12 Lachlan MacKay, 11 Michael Stephenson, 10 Adrian Jarvis, 9 Scott Mathie, 8 Rhys Oakley, 7 Hendre Fourie, 6 Kearnan Myall, 5 Marco Wentzel, 4 Daniel Browne, 3 Phil Swainston, 2 Steve Thompson (capt), 1 Gareth Hardy.
Replacements: 16 Phil Nilsen, 17 Mike MacDonald, 18 Gareth Denman, 19 Danny Paul, 20 Alfie To'oala, 21 Dan White, 22 Peter Wackett, 23 Scott Barrow.
Harlequins: 15 Mike Brown, 14 Gonzalo Camacho, 13 George Lowe, 12 Jordan Turner-Hall, 11 Ugo Monye, 10 Nick Evans, 9 Danny Care, 8 Nick Easter, 7 Chris Robshaw (capt), 6 Maurie Fa'asavalu, 5 George Robson, 4 Ollie Kohn, 3 James Johnston, 2 Joe Gray, 1 Joe Marler.
Replacements: 16 Matt Cairns, 17 Ceri Jones, 18 Mark Lambert, 19 Tomas Vallejos, 20 Will Skinner, 21 Dave Moore, 22 Rory Clegg, 23 Ross Chisholm.
Referee: Martin Fox