I can't remember how old yours are. Fighting between cockerels isn't all that unusual. It's how they set the pecking order and flock dominance. In some ways they aren't very normal if there isn't some fighting. Brutality is often more in the eyes of the human than in what is actually happening.
But this bothers me some. Usually they skirmish and it's over pretty quickly. But trying to pin him and packing the head can be dangerous. That's how they try to kill each other.
I once had a two-week-old chick being raised by a broody hen kill a hatchmate. No fighting involved. The aggressor chick pecked the other's head until it made a hole and killed it. The chick just stood there, didn't even try to run away. Mama hen did nothing to stop the chick. Then that chick started to do it to another chick. That's when I noticed what was going on. This was early morning. I isolated that chick all day, then put him back with the broody and the other chicks at bedtime. There were no other problems from that chick.
Isolation worked for me that one time. It doesn't always. If yours are older and hitting puberty isolating them for a time isn't going to stop fighting. Mine was well before puberty. When they did start puberty it wasn't that bad.
I don't know what else you can do than what you plan. Just keep an eye on them and base what you do on what you see.
