The scan forward command scans the spaces in front of Torque, and extands 5 squares. This means that if the scan forward only finds empty squares, then the obstruction must be in the next square, and the enemy in the one after that, so it can be fragged.
Therefore, Torque does a scan forward and if it shows only empty squares, he launches a missile.
Otherwise, Torque checks for mines, and then jumps to the Evade: routine.