If you're stealth you can, nothing better than telling them you're coming to get them or similar stalkerish talk. Then proceeding the put them against the wall.
When they are about half health.
"That's right, scream for help. "
And 1-2 hits before they die.
"It'll all be over soon.... Shhh,it'll be ok, no more pain. "
You can easily type and click between GCDs if you're
good.