loadout
Primary:
Enforcer
Melee:
anything except conniver's kunai
Cloak:
Dead Ringer
just stalk hale and try to stay behind him. when he stops or moves slowly try to get closer and backstab. if he starts chasing you just use the dead ringer. if you are far away the enforcer is good for dealing mini-crits.
this has worked for me in getting up to 4000 damage nearly every game