[It's that never-ending stubbornness, that willingness to disregard everything else that makes him snap; he whirls around, his voice raised, but differently from before-- this time, it's serious, it's real.]
There are things I can't give up on, either! And letting you waste-- [He cuts himself off, curling his hand into a fist before he tries again] -- and letting that happen is one of them.