There is no way to ohk another player without hhsn (which takes a GRENADE charge to use, it's NOT A MELEE ability). The Warlocks middle-tree melee ability attaches an a small void-bomb which knocks guardians away and then explodes, but sometimes the ability doesn't trigger when you die, meaning the melee charge was wasted if you die. These are 2 hits back to back but with a delay, the ability can only kill someone at full HP if their resilience is high enough though. The weighted Hunter throwing knife I get because it needs the extra precision damage to ohk (also gets a free knife back on the precision kill). Titans have a ohk charging ability that is available on 3 subclass trees, with the Synthoceps exotic perk active you can also get a ohk melee when surrounded by 2 or more enemies. Both the hunter and titan melees can ohk kill others even at max resilience. You can get a ohk melee on the warlock novawarp melee but only to an certain extent. The only way to get a guaranteed ohk melee in the crucible with warlocks is by getting a melee kill with Winters Guile, but everyone knows that it very rarely ever happens because the uncharged default melee speed on warlocks is complete garbage in comparison to the melee speed of hunters and titans. Is it really any surprise at this point to want a ohk melee ability for my poor slow warlock arms?