Whisks, I agree. Good on you for getting that training. And for myself I would have a go if I really had to. I am not small and I am strong, plus my boxing training means I can get force into a punch. But the club owns a duty of care to its members and I am putting it on notice that even if the first incident came out of the blue they can’t use that excuse twice.
I also think that training for the staff would give a much higher chance of de-escalating a situation.