My evidence is only in my CS. I had written thay Xavier is capable of delivering a 3000lb punch. And if you were to actually sever the arm completely it would be useless. Yes it could be swung around but I'd rather it stay off and fight one armed. Now if it is partially severed than yes, I would probably cover the wound and then kinda puppeteer it like on his left arm.

You just need to create a fanciful powered character like Xavier and then we can have the REAL battle lol.

No, Xavier does not have oxygenated blood. When he was changed from Human to Bloodbayne his entire body was warped and changed. Now it feeds itself off any chaos in the realm. So long aa it is not a perfect utopian society he will always have power. Muscles and the like are simply powered by Chaos energy rather than Oxygen.

 That being said, I have designed Xavier to have 3 times the amount of blood as an average person. In the past, my reasoning would have been like "just because". 

To date I have generated the following - To become a Bloodbayne one is to be infected with Chaos cells through special means. The cells attack red blood cells and replicate 4 times. The Chaos god of his world had been trying to gain power through this means. The Chaos cells would fill a random person and take over, taking the body to a special lake where the new Chaos cells could be harvested.

Long story short, the god chose Xavier to be his vessel but it didn't work quite like he hoped.

So yes, he would get light headed if he used to much because he still has a set amount. But it is still around 5.5 gallons.  I keep it liquified until impact most times so when he's in contact with it it will still flow.