Yeah she replied Richard in a very defensive way...maybe even still trying to convince himself, and then Lex responds "Are You Sure" (one of the best lines in the film) and despite what everyone else says I still think that Jason was reacting to the Kryptonite. It didn't effect him completely like Clark because his powers have developed just starting to but the reaction in the face (along with already being scared of the situation) seemed to indicate a reaction of some kind to the mineral.


Besides, he's an adult male, having lived on our planet for at least two and a half decades of his life, and he knows how to be careful not to exert too much force unnecessarily. The "super-breath" power works because he puts much effort into it (though it may not look like it because of his Kryptonian physique), just like lifting a five-ton vehicle with his hands. Same principle goes for having sex with Lois; I think the laws of physics apply to him despite his different anatomy and physiology.