His would-be attacker was a woman.
That rule says that an attacker should concentrate his forces in order to be stronger than his opponent at the moment of conflict.
Taran met the first attacker head on with his sword and sought to turn his horse with his legs.
Distracted, her attacker cut through one legging then the other.
He wrenched the attacker across his body and pinned him beneath his own body weight.
The attacker fell into the pit with an abruptly short scream.