First he saw me & brayed, then came towards me a bit, I was still walking towards him. Then he changed his mind and trotted away. I didn't pressure him too much, just gave him a break, then approached him again, which he dealt with better. I realized that it might be pretty intimidating to not have only me walking at him but both R&D who are stuck to me like glue! So I tossed them some grass & was finally able to actually get close to Ceelo. I had him target his new halter a few times.
I then decided to tie R&D so I can actually see how Ceelo's new halter fit, they'll run him off, and they won't leave me alone lol. After I got them tied almost immediately Ceelo came over and was all up in my business like 'hai, whatcha doin???' I easily slipped his halter on & got it all adjusted. I then had him follow me into the small pen so we could do a short targeting session. He did fantastic, he's really understanding that he has to touch it to get a click, not touch me, or sniff me, or try to figure out where the goodies are.
Had about a 5 minute session, that went great (haha no grass to graze on!), unhaltered him and praised him. Then I let R&D loose. I think Ceelo had fun. He looks quite good in his new halter, I even put rings on the noseband so Hithger can use it to start teaching him to ground drive!