If you are going to twist the helmet, make sure your head is not in it.
As for the ice axe, How can the plaintiff prove that the ice was safe enough to climb or that he drove it in deep enough before trusting his weight to it? I have climbed with ice axes before and there are numerous techniques to be mastered.
None of which are foolproof.
BTW, even a kevlar soldiers' helmet won't protect against concussion, and it can stop some bullets.