Initially I thought of checking for IsOnMount() using RegisterForUpdate() but then that would be horribly inefficient and I need to check exactly when this happens. Besides I don't know if dragons are detected by this.

So that then leaves with http://www.creationkit.com/RegisterForAnimationEvent_-_Form and http://www.creationkit.com/OnAnimationEvent_-_Form

However, I'm not sure what exact events I should use to detect whether the PC is starting to ride something. I found http://www.gamesas.com/topic/1360112-full-dump-of-all-animation-variables/ when searching the forums, but I have no idea how to make them work with the above function and event.

Help?