When I was raped, I was in such shock, that although what happened was indeed extremely violent(I had a lot of bruises for a while, and I hadn't known I'm that much of a fighter until that night), for quite a while I 1. pushed it to the back of my mind because I though I'm too busy to think about it and 2. I couldn't comprehend the word rape. although it was violent, it took me half a year to consider it's possible that what happened "wasn't right" and then another year to be able to say the word rape out loud. At the time I regarded it as an "unfortunate incident" and just had a lot of weird reactions that I completely pushed down. Everything I felt about it was fully suppressed. It only came back in bits and pieces and different reactions when I started trying to be intimate again, and in the worst way- when I finally started a serious relationship where I was really trying to be close to the person and where I felt safe. That triggered me the most.
So...In my experience anything you brush off tends to come back at one point or another. Unless you're really strong mentally and you are really unaffected, brushing off is often just defense mechanism your mind has until it decides you can handle it. That was the case with me, as I had also been sexually abused as a child so my understanding of what abuse is and what sexuality was was entirely twisted and repressed.
That being said, you can be in a dangerous situation without it necessarily becoming a trauma. I think it depends on the level of danger that your brain percieves in the situation. I had once an attempted rape happen to me, and the guy had the sense to stop(after I'd gotten decently scared). I was a bit shook up, and obviously we broke up, but it didn't affect me for that long. Whereas the actual rape I experienced later shattered my world in many ways, for many reasons. But that time it wasn't the feeling of dangerous situation, but literally I had moments when I wasn't sure I'll get out alive...so yeah, that one is still hard to get over.