In the video - after killer downs me, I'm not able to crawl. You can see my character jerking. I'm not sure if this happens always, but it's very common. Hasn't happened in situations where killer doesn't pick me up right after hit though - that is, if he walks away I can crawl fine. It has been like this since many patches ago.
You might guess that killer is blocking way to the exit, but this happens also in open fields with no obstacles.