Cambridge had nothing to do with the incident you mention. Hatton had a set to with Scott Taylor and punched him, Taylor responded by chucking the ball at him. The ref sent Hatton off for violent conduct (quite correctly), however Taylor was lucky not to follow him as I've seen players sent off for throwing the ball at an opponent.
Considering the incident happened in your area I doubt you were anywhere near enough to see exactly what happened, It happened right in front of me.