So something that we stutterers do to compensate (avoid stuttering) is choosing different words, pausing, using filler words such as “uh, um”. To someone without a stutter it might look like he is disorganized in his speech, but he’s trying not to stutter. You have to focus on what he’s saying rather than how he says it. I don’t know that there are a lot of videos out there of him stuttering because he has learned to cope with it, but I’m sure if you YouTubed it you could find something