Um...mind explaining how you can kill someone and leave them not dead?
Killing is the process, dead is the result.
"I was building my house until it was built."
"I enjoyed my muffins by eating them until they were all eaten."
"I strangled him until he was dead."
"I poured water out of the goblet until it had all been poured."
"I was (in the process of) killing him until he finally died."
"I even got a chance to enjoy the locals, by killing Um Bongo 'til dead."
"I even got a chance to enjoy the locals, by healing Um Bongo 'til healed.
Um...mind explaining how you can kill someone and leave them not dead?
"I
was killing him, but then you interrupted me!"
"This time, I killed him before you had the chance to interrupt me."
"I would try killing him again, but I already killed him, so I can't kill him anymore."
"Can I kill you instead?"
"Ask a Ninja!"