Full-face caged helmets almost always result in this type of exchange. You can't do damage to each other, so you completely throw defense out of the window. And since you can't hurt the other guys, you just try to "score" more by hitting him more times than he hits you. It's what my club calls a "Pillow Fight". People just rapidly swing at each other.
The funny thing is some of these guys keep trying to chain punch, but on several occasions someone drops a semi-decent cross into the mix, and it completely upsets the flow of the chain-puncher. You've got to wonder what would really happen if that facemask wasn't there. Would the chain punches actually do damage? Would that right cross drop the other guy?
Hmmmmm.....