Alexx : Because a cut on the scalp like that bleeds allot but poses no threat to the fighter. ( Some stitches will be needed to close the gash)
But it really is a superficial wound. The strikes to Shamrocks forehead are a different story. Those can cause a brain Injury from the blunt force trauma. It's like if you cut your hand and need stitches, It will bleed allot but it's not a bad injury at all. The constant blows to the head with the elbow can cause much more damage. Also remember a fighter has to be able to Intelligently defend himself or the fight will be stopped. Ken was not defending himself. 5 or 6 blows to the head were all unanswered.