I'm not quite sure why you might be having these dreams, but I think the best thing to do is to confront your attackers. I also have chase dreams quite often but I usually don't worry about it all that much. I've taught myself to just confront my attackers and just remind myself that I cannot be harmed. One time I was having a lot of dreams where people were trying to kill me or where I was in pain, so the next night I repeated to myself before I went to bad "If I am attacked I am dreaming." That night I dreamed that a monster with blade like arms was stabbing me, but then I just reminded myself that it was a dream and then the pain went away. After that I think I either left or teleported away. So, basically the best thing to do is just remind yourself that you can't be harmed. I also had another dream where I had jumped into some water off of a cliff and saw a giant sea monster. At first I was scared but then I reminded myself that i could not be harmed and instead fought the sea monster and defeated it.

If you are having a lot of similar dreams then it can make it even easier to become lucid. Just tell yourself before you go to bed that if you are being chased then you are dreaming. Once you master dream control, dreaming can be a lot of fun.