Is there a way to actually hit him while transformed?, It's just sooooooo freakin' annoyin' to keep runin' away like a schoolgirl while he's in such instance... LAME!
Best thing to do is, jump over him right at the beginning of the 2nd round, wait a half second jump back over the other way and repeat until he changes back to normal. If you have good timing, you won't get hit.