>>130240616i mean, anon, think of it like this. clark probably doesn't think batman know who his secret identity is, so if he utter "save mother", how the hell is this guy gonna save his mother, right. so he try to say his mother's actual name "martha kent", so that even if he die there, batman will know who exactly he need to go looking for. but as he was still suffer from the kryptonite smoke grenade that batman fired in his face, and a grown man's weight (maybe 2 grown men's weight) standing on his throat, he can only whisper "martha".