Their task? "Have a rap battle on treadmills," as the host explains.
The thing is, they never really get into the battle. Just a lot of "Yo, yo," and anticipation, as it sounds like they're about to launch into their rhymes, but barely ever do -- although, Bronson does muster up the line, "On my head I got the flashlight," before keeling over.
Eventually, someone runs over with a plate of food, which makes Mike wonder, "What the f--k are you doing?" Then Bam Bam slaps the plate away.
It's pure comedy.
Obviously, these two were never planning on having an actual battle, but the bit is hilarious.