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It is a tough case because of the proximity between the victim and the attacker. I think the only other option would have been a close quarters attack. Specifically, one LEO grabs the attacker and puts him in a hold long enough for the second LEO to put flex cuffs or regular cuffs on him and tie him down. Then let the other LEOs arrive and treat the victim. I do not have enough information to say definitively that that would have worked (there would have needed to be a tie off point for the attackers arms) but that is a probable method to end the attack. And, assuming it worked, it would have been far safer for the victim.
