Don't worry Billy, the bridge isn't that narrow or the height that great (it's narrower and higher :P )

Something tells me, Mirror never mentioned the magical barrier until now, and she's only concerned about herself getting out

Bridge might get perceived to be rolling and heaving as they step on it, too. Just to emphasize its perceived narrowness and height.
I wonder: will the target's perception projection power (PPP) get diluted by having to influence two instead of one? Will PPP get weaker as Tirin the Younger and Billy split up after crossing?
Eric Hines

@E Hines: Good questions. Let's say proximity is very important.

@Guesticus: Mirror sees an opprotunity...

@Merceneiress: I see an opportunity, too. I got something of which Target can be afraid....
Eric Hines

ahhh for a "Jedi / Vulcan " mind trick now... ore Magneto / juggernaut helmet to block mind reading...

@Merceneiress: that's... what worries me :(

"Two may enter, one may leave!"

If Abby thinks a moment she should realize she got into the previous scenario without being blocked; she should be able to get into this one the same way.

I think Mirror's bluffing.

@Mysto: she wasn't in the mirror last time, remember, Tirin was able to locate Lil Tir and Billy via a probe during the snake round because the locations are out in the open, the mirror is a shortcut portal to each location

@Guesticus: It still sounds to me like she's bluffing somehow. Abby hasn't even tried to call it yet.

Guess we shall see.

@Mysto: Abby doesn't have a reason to call the 'bluff'... yet