Whenever I run from a mob that much, I tend to attract other mobs. Then I die.
Run until you find a place they can't reach, then formulate a strategy for getting rid of them permanently. If it's a flying mob, it typically won't take more than two or three arrows, unless it's a wraith.

If it's a wraith.... Go find a place where it will be easy to get your gear back and kiss your arse goodbye if you're not yet at the level where you can handle Swamp mobs.