Yup, I agree. Feed him completely seperately from the others, Even feed him at a different time/place, then put him in a room with the door shut when you feed the others. This is nothing to take lightly. Keep a close eye on him, and do not leave he and Charlie together unsupervised for the next while. I know you love them both, and this is very scary for you. This may not be something he can be trained out of, you'd have to check with a behaviorist for that, but do plan on seperate feeding forever.