Quins end Shannon dreams of double
Darren Cave and Stewart Philpott scored first-half tries for Quins but it was 17-17 at the break as Frank McNamara and Colm McMahon replied.
Tries from Paul Marshall and Paul McKenzie put further daylight between the teams before Les Hogan’s try gave Shannon hope, but Niall O’Connor’s injury -time penalty booked Harlequins a decider with Garryowen.