Ok so this is how u do it:
MAKE SURE NO 1 ATTACKS BANSHEE WHILE DOING THIS BUG!
Step 0:
Let youre teammate('s) w8 down the hall, away from Banshee.
Step 1:
Fire tao/water Tao/ Reborns WITH thunder:
if u meat the requirements, CAll your guard.
if ur a tao/in possasion of Thunder go to step 2, if not, read below.
Step 1:
Tro/nin/war/monk with no thunder
Tro/nin/war/monk with no thunder, go close tobanshee, and get killed.
(keep ur guard skill in the skill position)
then revive as close as possible @ banshee.
Step 2:
hit banshee 2/3 times so ur guard will attack him 2.
(IMPORTANT)make sure guard attacks banshee.
Step 3:
Run back asap, and make sure your guard doesnt get killed by banshee.
Step 4:
Let your team kill your guard asap.
Step 5:
Enjoy a frozen Banshee.