A piece with too many duties
An overloaded piece defends two things at once. Attack either: the other one falls.
Take the rook. The queen must recapture or stay overloaded.
Go on then, take it.
3 more clean runs (at any point) to reach Recall.
Black's queen on a2 defends the rook on d5 along the long diagonal AND attacks f2.
3 more clean runs (at any point) to reach Recall.