[bjtheone]

Alternatively, why not hold the door open or drawbridge down with your ROBOT, and wait for a team member to enter the DEFENSE from the NEUTRAL ZONE. As they move forward, you back out of the DEFENSE into the COURTYARD.

Two ROBOTs should have no issues playing train through the DRAWBRIDGE. The SALLY PORT requires a bit more driving but is doable.

Nothing in the rues about having to traverse completely through a DEFENSE once you enter it or number of ROBOTS contacting a DEFENSE at one time.

CROSSING is defined, by the movement of the ROBOT attempting the traversal. Nothing is said about the state of the DEFENSE, (opened/closed or occupied/unoccupied) at the begining of the attempt.