Ment
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I just noticed that my message seems contradictory, haha.
So, we inspected the room (starting with the room's ceiling). We opened the door to the right corridor (we're in a door formation). Tsukiko carefully examined the right corridor (without entering). The ceiling and the water near the corridor, that's all. If there's nothing there, we won't go there anyway. First, answer whether it's clear, as far as we can tell.