What works for me...

1 add spawns at party.. 1 Far away.

If one at party is red, its basic, if far away one...

Healers are gaining emnity over you as it comes to the group.

So.. To battle this..

Use Fast blade on the one that spawns in the group or close.

Right when the red one is about to get there Provoke -->> Complete Emnity Combo and your set.