Fun fact - in the comics Forge made a gun that strips away mutant powers, and the government tried to use in on Rogue (which, having absorbed Ms. Marvel, was much more of a threat than her version in the Fox movies) - but Storm, ignorant to the gun's purpose, took the bullet for her. After that, lamenting the loss of her powers became her entire personality for a while. Comics being comics eventually she got them back - but I think that she is still a bit salty about this, and it shows in that scene.