Later I went and got Scout and headed to work with Zaz. They were interested in each other.
After a brief session of picking up Zaz's feet, I decided to let the two boys hang out together. I've been dying to see them next to each other, since they're about the same size.
It wasn't all peace and harmony, but there was no real violence either. I think if I allowed them to settle in together they'd become friends and start playing gelding games. But I took Scout back to Tonka. It may be mean, but I want to be Zaz's only friend right now.
Something changed in Zaz today. It was so subtle I didn't notice it right away. Hard to explain, but he felt like a normal horse. Not one that is stiff and afraid and waiting for something bad to happen. Not that he didn't get stiff and afraid at times. But mostly he was looking to me with interest and friendliness. It felt like a relaxed partnership more than it felt like work. It was really neat.