Those two have a certain connection going. The other day in my kickboxing sparring I ate a good combination to the head. Man, did that sap my stamina! I just felt like quitting and sitting down for a while until there was a chance to clinch for safety. Did you see the last Bobby Lashley fight? He was out of it after a couple of hits to the head. Think what it is like to be a pro where you can be certain it is going to happen. How do they overcome this?