These are great shots. I love the interaction in the first shot. I can't help trying to figure out what they are saying. I don't wonder at all why you were backing up in that second shot. The little cub in the last shot is way too cute.
Thanks to all of you. The mama in the first shot had scolded the cub for climbing too high up in a tree, and then it turned to play. It was great to watch. The bear in the second picture was moving directly towards me though not paying any particular attention to me thank goodness. Even so I was moving backwards while still trying to capture the moment.