I just rewatched Silva vs Hendo last night, and have to say that other than Yuki Nakai fighting with only one good eye I don't think I've ever seen a more gutsy performance than that of Silva fighting with that lump on his head. I know that Rahman had a bigger lump on his dome, but he looked like he was near tears even when they had stopped fighting. Silva was on the ground in Dan's guard and mounted for most of the second round with Dan keeping Silva's head as close to his as possible. I'd imagine the throbbing as the blood flowed to his head would be extremely painful even without them rubbing their skulls together or getting punched in that fuckin thing. Ouch, and GUTS.
Btw, that thing was initially caused by a clash of heads which dropped Silva to a knee for a second, it was shortly before Dan rocked him good with that nasty right.
Also, this pic doesn't even come close to the in fight views of that thing. It's more bloody in the sherdog pics but that thing was on SWOLE during the fight. Crazyness.