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Hmm, my thinking was that the 3rd move would put me in the next corridor... which I thought would be less safe because there is a ball in the ejector.

But I also understand that I might not be understanding the process correctly.

At the ends of hallways like in this case, it is like 2 crevices back to back (leaving no wall), so either square is a safe zone for up to 3 players in EACH of the tiles.