Everyone here seems to have hit the nail on the head about not finishing the word/sentence for him. I'm unsure if this is just me, and I'd like to know what other people think but I tend to find that when people are waiting for me finish speaking they kind of panic on what to do with their eyes and stare wide eyed at me. Maybe that's me being paranoid, it's kind of funny but does add an extra bit of tension ahahaha. It's almost like they forget what they usually do with their eyes when they listen. Made me realise most people are socially awkward. So try to relax around him is what I'm saying I think? I can pick up on peoples tension even when they're being polite.