You're naïve mate.
When you've had 2 lads pleading with you to walk away then the same blokes kick you unconscious you might think differently.
If someone threatens people with a bottle he deserves decking.
He's not like. Stokes could have walked away or he could have pinned the dozy twat with the bottle to the floor til the Police arrived. He should not have twatted him so hard he fractured his eye socket.
Once it became apparently the knob with the bottle was shit scared of Stokes (and the crowd he was with) he had options other than belting him.
It's laudable that he's stepped in to help out but I suspect that his actions as per the video will be frowned upon by the court.