I think my issue is I'm too used to playing big open maps like Dust2.
Mostly long distance hits with either an AWP/M4/AK. These quick close encounters seem to catch me off guard. In Dust 2 I can predict if someone is going to rush mid doors as an example and tazer them. Or surprize them instead of them me. I however realised yesterday that if I play a map I don't know, close quarters I get caught off guard and my reactions are way to slow to even counter it or ever have stood a chance.
Spectating you on that last map last round when the guy surprized you with the AWP you reacted instantly, taking cover, flashing and shooting him in the pip. I probably would have froze because of the surprize