This will become a tough case to prove. At most there is only a possible assault, the other is without further evidence in this case, which there very well could be the burden of proof is on the accuser. With her being a photographer there should be pictures of bruising, to prove an assault occurred, without that likely there is not enough to prove anything occurred. In this situation what if the 10 minutes was really 30 seconds (even though I am sure it felt like an eternity), and what if he didn't realize the pressure he was exerting on the wrist, and she wasn't truly saying a firm no and he was trying to encourage the situation, then this is a completely different story. Either way I am hoping there is corroborating information for either side of the story, because right now it will just turn into a mess for both individuals.