VERNO PHILLIPS says HE is the one that stopped the fight, not the ref. I know there were a few questioning the stoppage of the fight, well here is your answer from Phillips himself (in bold):
VERNO PHILLIPS SPEAKS ON WILLIAMS LOSS, UNDERGOES POST-FIGHT SURGERY!
By B. Artest
BA: Can you give us some thoughts on your performance against Paul Williams and tell us what went wrong?
"It just wasn't my night man. It's like this, I went out there and fought the dude and expected him to fight tall from the outside. When he first started banging on the inside I was surprised, thinking ain't no way he's going to beat me like this. I have to give it to him, the dude is strong, he can crack and I don't think anybody is going to beat that guy anytime soon. I wasn't at my best for certain reasons and it just wasn't my night."
BA: On television they said the doctor stopped the fight, did you agree with the stoppage?
Verno Phillips: "I'm the one who stopped the fight. I could have continued, but it wasn't my night. My tooth was really hurting me the whole week, and I had to visit a dentist in California to get a capput on it two days before the fight. The whole time I was out there, I just laid low and did my best to deal with the pain. The pain I was feeling was crazy, but I had to go out there and perform, so that's what I did.
BA: Williams worked the body effectively, did that surprise you?
VP: "Yeah, you know we watched him fight and the dude usually stays on the outside and head hunts, but you have to give him credit, he's getting better and he showed me and everyone else something new. I didn't think he would be able to fight so well on the inside."