"Probably something bad." Setsuna does not know a 'bomb' but at this point she sure does know Planker.

She's looking at the tangle, warily, frustrated, tired, deeply spent. Her brain is tracing circuits, connections, pathways, running numbers on autopilot almost before she registers she's doing it.

But the time keeps ticking down, and right as she finally decisively moves to shove a few wires aside and cut - the yellow one - their time runs out.

And inside is a small rodent with a giant fluffy tail, black, white, and vibrating, facing entirely the wrong direction. Setsuna laughs, slightly hysterical, the comedy of it all coming down to a dumb, childish prank of making them think something awful awaited but actually it's a cute fuzzy animal, surprise!, and falls back on her knees, tears stinging her face.

It puts her face right into the line of fire.