Now that's not to say that I don't recognize that he's pretty decent when we transition slowly. (My argument is that this is not PREFERABLE to traditional breaking.) I think what's happening...and I could be making this up...is that the defense is retreating to get ON defense...an - in usual transition-defense mode - they do so with urgency. That reaction usually results in an aggressive 'sucking back' if you will. Your intent on stopping the play at the rim; they converge. And so Evan finds himself with - what becomes - a 'soft defense'. They're lagging, from his perspective. And so he's finding open 15 footers.
You're right... not very textbook.