Block the defender's line of sight
Drop a piece between the defender and what it's guarding. Defender's still there, but its defence no longer reaches.
Physically blocks the defender's line.
2 more clean runs (at any point) to reach Recall.
White's queen on a4 defends the rook on d1 along the a4-d1 diagonal.
Physically blocks the defender's line.
2 more clean runs (at any point) to reach Recall.