How does Death Magnet work?-

"When exiting Vanish, pull all nearby Marked mobs towards where you entered Vanish. Range: 20 Blocks"
I find the wording on this to be very confusing, might be my lack of english.
When it says "nearby Marked mobs" does it mean ones nearby me when I exit Vanish, or ones near the pull location when I exit vanish?
Is the 20 block range how close they have to be to me for it to trigger? How close i have to be to the pull location for it to trigger? How close they have to be to the pull location for it to trigger?
It's very confusing wording I think

 

I really wouldn't recommend taking this ability, as it makes using vanish to engage in combat much harder. That being said, I think it is that mobs within 20 blocks of you when you exit vanish are pulled towards where you entered vanish.

 

yeah looking at it it seems pretty bad, i was mostly just confused ab what the words meant i doubt id ever use it