when the killer hit you 2 time your character will start to crawl on the ground. You have to stay in that state and crawl your way out and survive. The door have to be open and you crawl out or even find that hatch while crawling.
The way i did this one is by getting hit 1 time by the killer then open the door after the 5 generator done and wait for him next to the point you can escape inside the door. Wait for 1 more hit and try to get out at the same time so your character will fall down and crawl at the same time you escape