But would Jack be able to get there first? BC was the first one to escape the convention center by cutting his way through the time stop, and with his speed and teleporting it's doubtful Jack would be able to close the gap. I'm fine with Jack being the one to kill him, but he might not be in one piece by the time she arrives.
Anyways, just PM me or something whenever you want to collab.
Edit: What kinds of magic would the guy know anyway? I doubt it matters when two psychotic assassins... ahem, one psychotic assassin and a hitman both want him dead. He'd probably look like a 1000 piece puzzle before he could get out a single attack.