Eherhm.. after watching this video like 20 times, i just realized that old man punched him with BRASS KNUCKLES!
Seriously, watch the part where he holds the guy down after punching him, as well as when he leaves the buss. o,0
Edit: 1:50 and forward.
you can see from the start that is a plastic bag or a paper he's holding all the time
Epic Beard Man was previously famous for getting tazered at an Oakland A's gaime.
http://www.youtube.com/watch?v=7S4H3izw6Ng