The things is no one knows how they're going to react, because you're not rational, you don't have time to think and consider your options and your brain does whatever the fuck it wants to do.
At 13 I fought and screamed and scratched and treated and tried to bite. Did it help? Yes as it stopped before being too bad. The incident and having to fight, knowing what I was fighting against, were still incredibly traumatic.
At 17(much older,wiser ,bigger,stronger ) I just fucking froze. I couldn't believe it was happening, it couldn't be happening, it made no sense. He was my maths tutor, in his own home, with his wife in the kitchen, his son in his bedroom. There were 3 other girls at the table!! Despite feeling his hand under my jumper, it wasn't happening. Despite de pain from him grabbing and twisting and pinching. It wasn't happening. It couldn't be happening. Who does that? It was all in my head. Not just that, but I actually went for another session. Did that imply consent? It wasn't happening, but it kinda did so I never went back.
In other situations I played nice and made promises of a better time in a better situation, others I just ran. With my grandfather I was just outraged and then deeply ashamed. I remember asking my mother if I am really such a slut that my own grandfather would try it on. Him I did push away. It was the wrongness of who he was that got that response out of me.
You don't know how you'll react, what you internalise, how you'll feel until it happens. By then it's too late.