I have had jumping horses my whole life. Just because Justify has a little filling in his ankle and has been removed from active training, does not mean that he is retired. That type of thing usually resoves itself with a couple of weeks of rest and a 'sweat' applied under a support bandage. Now, maybe they might choose to retire him and send him to stud now because it's the most profitable moment and he's undefeated.
It's hard to believe that he will be the second triple crown winner I've met.
so maybe he was bored.