You can't walk on glitched tiles; the game registers them as another wall without a terrain description. My help contact honestly doesn't know what the hell happened (never a good sign) and suggests I remake the map, so I'll try that later.
Also, credits to Miss Tama over at FEP. <33333333333

(12:59:12 PM) enlacedbyfate: Too bad Vika's role in this hack now is condensed to that of an NPC, though.
(12:59:30 PM) fiveshiftone: Tibarn's is, too.
(12:59:36 PM) fiveshiftone: He's sorta like a Greil, I think.
(12:59:43 PM) enlacedbyfate: Nah, he's playable for one chapter, the Party.
(12:59:52 PM) fiveshiftone: Ahhh.
(1:00:11 PM) fiveshiftone: A place where he's best suited to mopping up all the faceless at the gate.
razz (1:00:48 PM) enlacedbyfate: Vika never is. She starts out as an enemy (which works out, because they have no laguz units), then changes to NPC during the "Show of Power".
(1:02:09 PM) enlacedbyfate: Stays NPC. If the Infiltration had had better results, that would have been a playable chapter for her. But it didn't, and now that it just leaves the final battle, she's far too injured to help in any capacity.