I wouldn't worry much about it. BP's along with other snakes that are able to climb like to wrap around stuff, especially if they feel like it'll support their weight. Mainly it's so that they don't fall, most of my snakes that can climb will at least wrap their tail around something so they're secure. My rufous beaked snakes, even the one I had before always wrapped their tail around my base of my little finger and my Yellow Anaconda used to wrap around my wrist.