I'll tells ya!
Retaliation is not the same as defence. IF Anning had have swung blindly then he could say that he was defending himself from attack. However, he turned, saw a person half his size just standing still and then hit him twice in the head.For retaliation when he was attacked from behind by an unknown attacker of indeterminate size or intent? I don’t like the man but he has a right to defend himself.
Now the people around him that “stacked” on that’s a different story.
You are not allowed to 'retaliate', that is an example of taking the law into your own hands. The legal path would have been to report it to the police. The illegal path is to use violence against some one as punishment. I doubt there is a court in the land that would believe Anning if he said he felt threatened and struck the kid out of self defence, it was very clearly out of anger and revenge.
The kid might be playing a very smart game here. You can be expelled from parliament if you are found guilty of a crime that is punishable by a year of more of imprisonment. The kid cracked the egg on Anning's head and then stood back, motionless and filmed it. If he presses charges and Anning is found guilty, the kid may have trapped him into removing himself from the Senate.
Watch this space.