Help: I am at the end of the furnace level having sliced the rather large chap into human sushi and got in the lift with takes me to the top of the building. Having killed the two chaps where the lift stops, I cannot find anywhere to go. The door is locked and there do not appear to be any other exits. I have tried 'dropping' off the platform the one below but this always kills me before I have fallen anywhere (i.e. in contrast to the earlier part of the level getting into the waste buckets where you only die when you hit the ground) so guess that this is not the solution. Thanks for the help.