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+1, by the rules of the bugged passage this is unambiguously a Town Portal for blue.
Actually, it's an easy game: you ask your opponent; if you're not sure, you save immediately and ask the judges. Let them scratch their heads :D
The most logical scenario from the screenshot. Red, from the Dungeon, cast Dimension Door/flew towards the neutral grassy respawn, escaping from blue, broke the guard and flew further on wings/fly, so as not to spend moves on picking up a pile of wood. Another possible scenario is that red found a КЗ there, broke the guard for experience, or just to waste extra moves, and then cast Town Portal home. It's easy to talk about bugs, etc., but during a game it's hard to account for the possibility that the generator simply didn't provide a guard. Such a thing is possible in 1 out of 100 cases, IMHO. Perhaps I don't have a lot of experience playing Jebus Cross; let the experts chime in on how often respawns are provided without a guard?