Ain't a bad cold start for 19deg! Those B's are nice little tractors. I got a '45 B sitting behind the garage waiting to be revived... runs, but needs rear rims.
I like seeing you start it like that. When you do it does two things for you if it kicks back. It pulls it out of your hand and the momentum of pulling on the crank clears your body away from the crank if it kicks back.