Bubbles, here, sink. They begin at the ceiling of the page and drift downward like sediment in a still glass. This is not what bubbles do in the world we left behind, but it is what they do when the world has been told, gently, to play in reverse.
Waves retreat from the shore without ever having arrived. Pencil marks lift themselves from paper and curl back into the graphite. Footprints in the sand fill themselves from the inside out. Nothing is destroyed; only un-done.
The cafe windows fog over and then un-fog. The conversation you almost ended is, briefly, beginning again. The salt that the air carried inland is returning to the water it came from. None of this can save you, exactly — but it is, for a moment, a kind of mercy.
This is the grammar of undo: not delete but retract. Not erase but un-write. The mistake stays in the room, but it is held now in a glass jar with the lid loose, watching itself be unmade.