689c1edc_Resources_in_Portland__Oregon___Why_it_Works
[If you want to say…] “STOP hitting your brother!” […try this instead.] Physically block aggressive behavior, if necessary, while saying, “You’re so angry! I’m not going to let you hurt him, but what do you want him to know?” [Why it Works] 
The goal is to reinforce the avoidance of violence while at the same time acknowledging the valid emotion and offering a pro-social way to express that emotion. Simply trying to stop the behavior doesn’t work. The child is left with internal angst that she doesn’t have an outlet for. I have written in more detail about this here.
Frustrated? Try This Response Instead! » Core Parenting - Parenting Resources in Portland, Oregon.
Why it Works