Basically, in this routine, Torque turns to the left, and then moves forward if it is safe to do so (no mines etc). Otherwise he moves backward.
Then, if there is an enemy on the same axis as Torque, he jumps to a routine to deal with this. Or if there is an inbound missile, he goes to an evasive routine.
Finally, if nothing else interesting is happening, Torque goes to his
err_ #cur_head routine
which turns him toward the nearest enemy so that he can resume his normal