You have bad memories about it? Flashbacks?
I bet the op was running full speed to the exit, without any scouting, on the open terrain (on the railroad tracks) and probably got nailed during door opening animation. I have endurance and strength max, i never camp. Because i don't have to. I play this game with the most speed possible, without turning it into UT or cod shitshow.
He outsmarted him. He knew that he will try to extract. And probably checked rest of the extracts, narrowed it down and waited. Well done, nothing else.
If you spawned custom side (old spawn) there are 3-4 possible extracts. Did you check them all?