Yesterday's close encounter

Yesterday I was driving through an intersection (yes with the bus) and I had the right away as I was going straight. This guy was across from me with no blinker on and waits until I get right in front of him to decide he is turning left and proceeds right in front of me. Do not ask me how I stopped in time when he did it about 20 feet in front of me! Luckily for him I was not going fast, the light had just turned green. The kick in the butt was he looked at me almost like he looked through me and went. Then he waved to me and you can see his mouth say thank you. Thank you?? For what not hitting you? Funny part was he was leaving the hospital when he cut me off, he is lucky he did not go back in!