What do you mean it's extremely unlikely that he would stop? This could have been his first time. Maybe he's done it a few times, we don't know. I think you're asserting without evidence that anything short of him getting stabbed is going to stop him from being a serial perv.I didnt directly answered it, but .i thought you would have seen the points adressed. Any violence beyond what is necessary is too much violence. Thinking the guy wont try that again because you hit him is a moot goal, if he was truly afraid of the umbrella he could have taken it our of her hand. He didnt because what he was truly afraid of was exposure to public attention.
So it was too far because it used unnecessary violence. Unless she was planning on stabbing him and probably even if she had stabbed him, it is just extremely unoikely he would stop doing that from then on. He surely wont ever do that to her again if she looks at her again. That part is reasonably likely.
I'll knock the wind out of someone that assaults me in the chance that gasping for breath on his knees from a punch to the gut in front of people is an experience he might remember next time he considers another random adventure in public perviness.
That's not a contradiction. You're the one linking her hitting him with the notion that it might encourage others to attack; I'd suggest the opposite, that being aggressive limits the chances that the next guy wants to come in and risk violence towards himself. It's not a gang war; it's a perv touching a woman on a bus.Now you are contradicting yourself. Before you said her force was not excessive because she didnt know if the guy had allies there, now you recognise if he had allies she had no chance ( and so, escape would have been the smart thing to do) .
So hitting extra because maybe he has allies makes no sense. If he has allies you hit as she did so he gives her space to stand up and then go out of his reach while mantaining the unbrella up. They would have to follow up in a row to get to her and that is easier than getting deeper into the back of the bus so you can hit a couple of extra hits and they can surround you and take the umbrella from you if they truly feel endangered.