When you use the phrase "help him with X" or any other similar phrase, you also imply that you're also doing the same thing and you're receiving help from another person, but what if you're not? What phrase would you use then? Let's say you said "Albert helped him restrain Robert", but only Albert was restraining him, while you were trying to feed him medicine, what phrase or word would you use to say that Albert restraining Robert was an act of help. You can just say he restrained him, but you can't also add the idea that he was helping you without making the implication that you were also restraining him.
Albert was ____ with restraining him while I was trying to feed him medicine.