Unless you're mass PvPing or your target is crowd-controlled you will NOT get an Aimed Shot off. Don't bother with it (Especially with the new Entrapment nerf, it's even more useless than it already is.)
In either case, the best way to a Warriors heart is being Survival, this is at least how I deal with them:
1. Serpent Sting, and while possible as many other instant shots I can fire.
2. I drop a Snake Trap and I put Aspect of the Monkey on.
Meleeing ensues here. Raptor Strike whenever. Mongoose Bite whenever. Wingclip when you're not doing the previous. Counterstrike whenever. If you get an immobilize proc off: Go back to step 1. Pop Deterrence if you feel like it.
Alternatively if you start on a good range you might get an Aimed off, drop a nice freezing trap and rinse and repeat:
1. Aimed, Multi, Auto, Arcane
2. Warrior gets trapped, move back
3. Aimed, Arcane, Wyvern
4. Warrior gets 'trapped', move back (Beware poison/sleep removers - Wyvern Sting is a very weak skill.)
5. Drop a new trap. Aimed, wait until the DoT appears, Scorpid.
6. Back to step 1!
It's very situational really, but these would be 'default' templates from which I deviate usually. In PvP this rarely happens, in Alterac Valley I'm not interested in killing players unless they're in the way, in WSG I generally only slow people, in AB I only tickle players touching my flag. In the arena my warlock will generally fear things or kill them anyway.
Or in the case that the warrior finally got his epic imba weapon, he'll three hit your 10k hp :)