I'm sorry that happened to your son. My 6yr old went through the same thing a few days ago. Our roo is going on 8 months old and are rather large(brahmas). My son shocked me because he just reached out and grabbed the roo by the neck and flung him to the ground then ran after him crowing and flapping his arms. I know I shouldn't have but I was laughing so hard at that roo running from him. Now the roo stears clear of my son. Yea its ok to let him kick, punch, fling, or do anything else to defend himself against a roo. They CAN seriously hurt kids.