[ Here is Rex, in their room, with his ear pressed up against a wall! At first he just looks focused, but his expression quickly morphs into one of confusion, then scrutiny, then settling onto...alarm. ]
Hey! Get over here! [ he hisses in Yukio's direction and waves him over with his free arm. ]
[Yukio nods sharply, raises a hand to try and get Rex to be quiet. He steps back, grabs a piece of wood he's been using as a sort of walking stick/poking at weird things tool, and raps it against the wall.]
w1, monday
Hey! Get over here! [ he hisses in Yukio's direction and waves him over with his free arm. ]
oh no i missed this one
He doesn't press his head against the wall, but he does listen.]
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Do you hear that?!
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It's like there's something moving in the walls!
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What are you doing, you're gonna alert it to our position!