I am curious about how you remember your perception of time. This is a simple description, but it is "fast not fast" when it is happening to you. "Yep this is happening. Oh, they are going 25. Yep they are going to hit me, that is going to be scary, possibly hurt, and cost a lot to repair. I hope this doesn't hurt my neck. I should put my feet flat. Crunch. Okay, that didn't hurt. The airbag didn't deploy. ..." In about 1 second.
Watching the accidents it is sort of surreal, just sort of flat. Bang. Spin. Stop. Airbags deflate. I immediately check surroundings, move out of danger, call 911, try to recall safety things, keep people in place if their injuries seem serious and their vehicle isn't on fire, but it all feels "real time" watching things. It just doesn't register the same in my brain.