Well, maybe gone for it, but just perhaps he should have gone for the ball with his head, as it was head height?
Intent isn't important in this case. Intent is only important for violent conduct, eg kicking or attempting to kick an opponent. Serious foul play is about endangering the safety of an opponent by being reckless and/or careless, using force capable of inflicting serious injury. A broken face Is serious.
I actually love Liverpool fan's defence of your player though, even though I think you have no grounds for complaint.