So here is a very common occurrence on DBD: a hook camping Bubba
This one has particularly honed his skills and added the insidious perk (which silences his heartbeat after standing still for 6 seconds)
Luckily, I was anticipating it when I went attempted the rescue and sprint burst was able to get me to safety.
Personally I hate this style of killer gameplay and feel that there is no need for it at all. And it will end up putting lots of people off of not dealt with effectively by the developers.