Goku is the kinda dude that likes to give people a chance by talking to them buu said he was buu and that he wanted to play and goku was warned about jenemba but thought he was like a baby and the reason he was talking to jenemba after he had transformed is because he wasn't strong enough to beat him if its atheon it won't take long to say hey stop atheon shoots goku sais I'm warning you atheon shoots again then goku blows him up simple.