Really? Here's something from after the trial where Corner was found guilty of GBH (his 32nd conviction)BBC News - Palestine Action activists guilty of Elbit Systems site raid - BBC News https://www.bbc.co.uk/news/articles/cm2p99rxr5po?app-referrer=search
They put forward that defence in trial but the video obviously doesn't back up their turn of events, because the victim wasn't holding a hammer.
I suppose you will believe whatever suits your narrative but I prefer to base my opinion on actual facts.