Just where his hips have finished causing him to be rolled out and on the heel. He has a great release but I can see how he might get a few more "pulls" than he's looking for.
This goes back to a very long and lengthy discussion.
Although you can't see it too well from this angle, his left hip has pulled away from the ball and his right hip is finishing over the ankle of his left foot instead of over the toe of his left foot. This causes him to finish out of balance in my opinion. I know lots of others will differ. But here's what I'm seeing.
The pulling of the left hip is going to pull his whole left side away from the ball and tends to cause people to come accross the shot. Instead of pulling accross Brandt makes a HUGE forearm roll for a release to compensate. It's a tricky fine line he's walking and if he doesn't do that huge release, he'll end up pulling the clubhead inside just a tad and cut it. If he releases the amount he does, but finishes in better balance, he'll hit a pull hook. With just the right amount of left arm pull accross, and forearm roll over he can keep the club on plane.
I guess the most direct way of putting it that applies to everyone is, with a neutral grip and a pulling of the left hip away from the ball, the only way to compensate is to time a major forearm rotation. On this swing Brandt aparently did time it just right.