He doesnt deserve to be knocked out just for that little thing he did. If someone did it to me i would probably laugh, its not like its harming me.
You could just wipe/wash it off, no big deal. I cant believe people think its ok to knock someone out because they slapped you with pizza, quite different objectives and quite different meanings. He didnt mean any harm.
The guy who hit him was more of an ******* if you ask me.