Your child is attacked by an abductor that grabs his right hand with their left hand. This hold is referred to as an OUTSIDE WRIST GRAB. Here is what your child should do.
FIRST, your child should step in toward their attacker lifting their left forearm up (their fist about should height).
SECOND, your child should block their left forearm into their attacker's left wrist from the inside causing the attacker to release the hold.
THIRD, your child should quickly run away and seek assistance from a PERSON IN AUTHORITY