I’ve had that situation before. Making one “be alone” really helped. I kept it totally separated from the others all day and put them back together at night. The behavior changed radically. That chick kept up a plaintive peeping all day but it was not harmed. It got over it.
However you can make a basket out of hardware cloth or some fine mesh wire the chick cannot get its head through and set that basket over it in the brooder. Make sure it has food and water. At least it won’t injure or kill the other chicks while it is in there.
I grow a little impatient when people seem to think that they are unique in the world. Of course they are. Just like everyone else.