How does betrayal booting work?

I was just in a CTF game and some guy killed me. He then killed my guest. Neither of us got the option to boot him.

I killed him at the end of the game when I knew we were going to lose and I got booted immediately.

Why is this?

boot only works when you picked a power weapon, have control of a veichle, have the objective/flag these 3 things are 1 kill and you can boot the rest you can boot but vary to much