The easy way of doing it is
1 person dives in and smacks the 1st enemy in the mob, do a full combo on it to build decent emnity. The other dps then dive bombs the other 2 targets to grab remaining emnity. After emnity is grabbed everyone will switch to the lowest hp enemy and zerg it down.
Its better this way because you'll bresk up the damage distributed from the mob. Instead of 3 baddies curb stomping u, u'll have 1 or 2 poking u while the other is attacking ur bud.
Also it helps to be on different levels of dps as the highest will generate more emnity etc lol

Also second wind is a must if u wanna survive after ur dodge.