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Agents can drag the bodies of knocked-out or lethally-wounded guards or other agents, carrying the body with them as they move. An agent can carry at most one body, and there is a movement penalty while dragging a body, so the agent cannot move as far with their AP.
To start dragging a body, the agent must stand on the same tile. To stop dragging, the agent must be on a tile where there is not already another body.