I don't know what material the ufc floor is made of, but it seems to absorb the blood. On a non-porous surface, blood could easily be wiped away, as it is with wrestling mats. The blood on the ufc surface seems to soak in. I guess if I were a fighter coming into the ring after a severe bloodletting fest, I might be conscious of not wanting to be on my back in the blood; perhaps in the heat of the battle, such hesitations dissipate. But just how hard is it to get a bucket of hot water and bleach and wipe it up? There is surely more than enuf time between bouts!! It is left there on purpose, which shows the ufc folks think its part of the ambiance! I watched ufc 61 and was very turned off by this; I guess had at least one fight been worth it, my revulsion would have been mitigated. But the blood seems to be the most noteworthy aspect of this particular ufc -- which is why a week and a half later it is still such a huge subject! Congrats to the ufc folks on making the blood such a significant factor in an otherwise boring as hell evening. (yes, the 40 seconds of Tito's fight was enervating, but overall that fight was obviously very anticlimactic...