If true said individual totally unfit to be in command. Not only assault but a vicious and potentially fatal/life altering and to one of the crew they supposedly have a duty of care to...As usual there'll probably be $$$ paid to make it go away
What duty of care is that? The company has a duty of care to the entire crew. You could argue everyone on the crew has a duty of care to each other to perform properly at work and especially in an emergency and I suppose also in a pub downroute. That's called common decency. The purser's in charge of the cabin crew, the capt signs for the jet and flies it and occasionally gets a kick in the ass if any of the CC act up on a layover.
What special duty of care does the captain have? I don't remember reading about it.