I had a conversation with a new director at work which turned very sour. I'd accidentally copied in people I shouldn't have to an email and had apologized to him in this conversation. This clearly wasn't enough for him and he proceeded to try and tear me a new one. I wasn't comfortable with the way I was being spoken to so tried to leave the room (with just us two in it). I managed to open the door a couple of I inches and he slammed it shut and held it shut and told me he wasn't finished. I told him to let me out of the room, which he did but I was so shocked and shaken. AIBU to call this threatening behaviour?