You think anything will stop em? Lol...I was doing this event this morning and boxer_ or w/e tried to steal mobs from my vortex and he got like 2 of 50 mobs? LOL....
or u can use an aps EA with atleast 1.82 aps , their vortex hits mobs 15k ur aps ea will hit 40k u just take mobs w.e