There needs to be a level of cooperation in order for competition to be interesting, at least to me. 

 Poor two second analogy, but I have to be willing to admit you hit me in the head.  I didn't block it.  I didnt tense me neck muscles at just the right time to absorb the force.  I didn't open my mouth and bite your fist at the last second.  I'm not actually a master of the Iron Jaw technique and therefore you didn't actually just break your own fist in my face.

You got me.  It hurt.  I'm probably bleeding.  My bell is a little rung.  I'm gonna have to adapt.  I wasn't ready for that.  Fucking ouch man.  Damn.