Double Escape Artist or Double Backstab won´t do much job if the enemy OHKs you with their first melee (which is really very possible considering titans and warlock melee)...and you still have to hope that Backstab triggers which is inconsistent. And there is a reason you almost never see people using Escape artist in PvP...it just doesn´t hold up. It wouldn´t have to be something like that. It could specifically buff nightstalker giving him a second smoke bomb and furthermore allow nightstalkers to move through the smoke without being slowed. That woul perfectly fit their lore and I hardly think it would be OP...that´s what I´m talking about