following is my routine for party w/o sleep caster

shield lob @ target 1
flash
stun @ target 1 (if healer is slow at healing)
fast blade & riot blade @ target 1
roh @ target 2
flash
fast blade & riot blade @ target 1
roh @ target 3
fast blade & riot blade @ target 1. (repeat)

most likely target 1 will die very soon at this stage