Sizemore says "you don't send a caster from the Magic Kingdom to enter a city you don't control." Flimsy, but it very slightly implies that there might be occasions when leaving by a different portal than the one you came in would be acceptable.
I think the issue of being able to enter the Magic Kingdom off-turn and without move is important, too, but I'm not sure what it implies: does it suggest that multiple portals can exist, because crossing the area boundary into the MK isn't cheating; or does it suggest that they can't, because it would become a gamebreaker if the caster could cross the second boundary to leave again in a new location?
Ya know, this could turn into one of those rules-lawyering sessions that every GM dreads . . . I can seriously see Parson getting up on his hunkers and telling the PTB in the MK -
"Look, the simple fact that I didn't croak going through the portal means I have a right to be here - if I didn't, I'd be dead, right? Since I didn't, then the Titans said it's in the rules. I'M
following the rules, you aren't. I went from one portal I controlled to another portal I controlled. Nothing in the rules says I can't do that. I was even nice enough to put in a tunnel so I wouldn't disrupt traffic and annoy everyone!
not the one pushing this Toolism cwap, that was that idiot Ansom, who's not an issue any more since he got hijacked by his crazy girlfriend. And if you don't like what Wanda is doing, then get your own fwiggin' Arkentool and go talk to her about it! She says she's following fate - who am I to argue? I'M
just doing exactly the same thing everyone else is doing around here - conquering our neighbors. Like the Titans meant us to do. So, just WHAT is your problem anyway?"
The Truth Will Set You Free. But First It Will Piss You Off.