I just moved them over to a ration balancer. I let them adjust to it over the course of a week, and last night was the first time he ate it by itself. The pellets are longer and thinner than the Nutrena Safechoice I was feeding him. This little boy takes the tiniest bites, so it was surprising to me that he choked on it.
After his episode, he went back to eating immediately, and had a BM on the way back to his stall as well. Henny poops ALL the time, silly boy. He had normal gut sounds and obviously everything was moving along. I guess it was just a freak thing where he took a bite oddly. I'm not sure, but I'm glad he's doing better.