Kirstin is detemined to carry the flag on a Mustang. She has to post the Colors at a playday in November and would love to do so on either Kriptonite or Dynamite. As you can see Kriptonite has no problem what so ever with the flag. It was a little unsure at first and took just a couple of steps back, but Kirstin kept talking to him, reassuring him that he was alright and look at him now. She let him chase the flag around for a little bit before waiving it around his head. "Chasing" a scary object is less scary than the object chasing him, so horses seem to accept it faster.
No problem going over the rump.