Newsflash!! Fighter gets hit in fight. OMG!!
You're argument is pretty flawed. Tom got hit with a punch like any other fighter gets hit, that's what happens in fights. Fighters get hit. It's how the react that matters. Tom ate the punch, shrugged it off and then finished Sergei shortly after. The punch had no effect on him or his performance.
You would have some point if the punch dropped Tom, wobbled him, or made him more hesitant. But it did nothing to him. You bringing this up actually make Tom look better like he has a great chin, you're contradicting yourself.