dont worry Serra has "HammaFist"
but on a serious note, they'll be fine fighting each other, its all part of the Sport, enemies in the ring, friends after the fight
just like Rich Franklin and Anderson Silva, they both respect each other and are friends, and Rich couldnt say enough good things about him, even several weeks after the Fight...
"Anderson is a great fighter, and my hats off to him. He is a class act, and I could not have lost my belt to a better man."
"It is a difficult thing sometimes to fight in the UFC…all of your co-workers/opponents are such great guys, you almost hate to step in the octagon with them."
but you know, when it comes down to it, its a JOB, and most of these fighters have families and are not from a wealthy back round, so its Most important for them to put food on the table