When a light plane lands hard the structure may bend so that the door (yes there is inly one) will not open. I had this happen to me in a 310 that the polit tried to fly through the run way. So here you are after having the stuff scared out of you comming to rest on the ice , first you get out, with out the door through the window is a tight fit, so you step away from the aircraft and take a deep beath and about that time the ice starts to crack and break up so the choice is the move the a better place where you will not have to swim for it or go back from life raft ect. I think they made the right choice.

I have heard it said what you have on you is the survial equipment the stuff in the back of the plane is camping equipmnet just to make things easier.