First, I'd bet you are going to hear "get a trainer" a bunch. This is appropriate advice and could keep you from getting seriously injured or ..... From your descriptions it sounds like you aren't sure yet if the palomino is attacking or bluffing.
If you continue to work personally with them, I would look at the training that is done with Mustangs when they are first brought in. Here is a link to a site that has lots of training advice and links to gentling mustangs. KBR's World of Wild Horses & Burros: Main Index
There are also quite a few YouTube videos on the subject that may prove helpful.