I've been bitten by snakes 3 times that I can remember. Once by a wild snake (black rat I think) that I caught to show my kids up close then released. Once by a baby king snake in a pet store. Once by our bp when she was in shed and I think I may have startled her by reaching in to her tank too quickly.

None hurt enough to count. The wild snake did open really wide and leave a big, but superficial, mark on my arm. Neat little circle of pinpricks.

Our bp did also bite my bf one time. We feed f/t and do the zombie mouse dance. One time the mouse slipped out of the tongs, and somehow in trying to pick up the mouse with the tongs, got his hand close to the snake.

To the OP: it sounds like a feeding response to me. Even if you had washed your hands, the scent was still in the room. I think a bite and hold is almost always a feeding response, but sometimes it might just be that their teeth get stuck because they do have backwards pointing teeth.