Tuukka Rask still isn't sure when he suffered the injury that, in all likelihood, has ended his regular season. In the second period of the Bruins' 3-2 loss to the Islanders at TD Garden March 3, Rask dropped into his butterfly position to stop a Matt Martin shot. Then, when Martin's shot deflected off Greg Zanon's stick, Rask tried to adjust for the tip. Rask may have suffered his lower abdomen/groin strain prior to the deflection. But all he can remember is the sound and the pain. "I heard a snapping there,'' Rask said. "I knew right away it was pretty serious.''