If it was proven that he did beat her up then he should be punished like every other individual. However the problem I have is that society view on this case is not equal. For example if rhianna had beat chris this badly even with a bat or another blunt object she would not have been villianized and people would have first believed it was in self defense or that she finally snapped after being abused on many occasions. Even if physically abuse was not the case then people would have still said that she was provoked (like how they say with any woman who commits domestic violence) and that makes her less culpable.