Great name!
I had a gelding who came running and whinnying when I called him, the one and only time he escaped from his paddock. He was nowhere to be seen, so I was very happy that I didn’t have search the woods or the dirt roads.
He was the same horse that when I went off him out hacking (twice in 18 years) would stay with me and wait for me to mount back up. I think he was insecure out in the world on his own.
Awaiting more photos of your Forrest when you have time.