Marek Kascak converted a 13th-minute penalty and Michal Hubnik's injury-time strike made it three before the break.
Bendtner's strike made it five successive matches in which the Gunners have scored in second-half injury-time.
But the Welsh side did earn a losing bonus point courtesy of Morgan Stoddart's injury-time try.
With the game lost, they did manage a losing bonus point courtesy of Stoddart's injury-time try.
O'Neill's injury-time free gave the Red Hands a 0-7 0-5 advantage at the break.
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But despite being a man down, Murphy charged over for another Irish try in injury-time.
The visitors had substitute striker Stefan Maierhofer sent off in injury-time for his second yellow card.
It was a remarkable kick, earning both sides a further 20 minutes of injury-time.
Montella had laid the foundation for a fine comeback, which was capped by Routledge's injury-time winner.
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However, injury-time tries from replacement Des Dillon and Gordon D'Arcy brought Leinster's total up to 48.
Linfield's lead was not threatened until injury-time when Chris Scannell fired a great chance over the top.
Morne Steyn's injury-time penalty earned the Springboks a dramatic 28-25 victory and sealed a 2-0 series win.
Sexton failed to convert and also pushed an injury-time penalty effort to the right of the posts.
Lua Lua then broke away to set up Matt Sparrow who bundled in a fourth in injury-time.
For all Coleraine's domination, the best chance of the half fell to the visitors in first-half injury-time.
Warwick fired over his second penalty before Ulster stunned the Limerick faithful with another try in injury-time.
Anton Ferdinand's injury-time own-goal gave United a point, but it was Wiley's display that incurred Ferguson's wrath.
An injury-time free-kick for handball saw the whole Aston Villa side - including James - dash into the Chelsea area.
And although Ryan Cross went over for an injury-time try, Giteau's missed conversion handed the Scots victory.
Rovers thought they had snatched a dramatic victory in injury-time but McCarthy's effort was ruled out for offside.
As the game went into injury-time, Liverpool grabbed a lifeline when Neville dived to palm away Lucas' shot.
Paul Meegan had an injury-time chance from 30 metres from Monaghan but he pulled his shot off target.
Drogba outmuscled Steve Finnan and fired in at the near post before Lampard headed in an injury-time fifth.
Tim Cahill secured the win with a stooping close range header from a Leighton Baines cross in injury-time.
The visitors equalised in first-half injury-time after defender Wilkie's first shot from long range was blocked by Jones.
Meanwhile, manager Simon Grayson praised Alan Gow for salvaging a point against the Bluebirds with an injury-time equaliser.
Boro had plenty of the play but lacked composure and McSheffrey added an injury-time penalty after being fouled.
Chelsea were defeated last season by an injury-time Andres Iniesta goal in their semi-final against eventual champions Barcelona.
Goalkeeper Andres Palop headed an injury-time equaliser as his side were within seconds of going out of the competition.
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And an injury-time chance fell to substitute Eric Addo in the six-yard area, who just could not convert it.
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