What constitutes a leg reap?? Is it merely the outside leg when preforming a leg lock going across the leg??
if ur referring to the unwritten rule in ibjjf competitions, then i can only describe it as when the attackers leg crosses the hip line of his opponent.
eg: if the attacker is using his right leg to attack the opponents left leg, then it is illegal if it passes the opponents left hip. then again, they dq'd competitors for even looping the leg around before even getting a chance to cross the hip line