That was such a weird sequence. First Edmund got a little unlucky that a point was not replayed after a call was overturned and then next point (break point) he clearly doesn't get to a drop shot before the second bounce and hits a "winner" but the umpire completely misses that it bounced twice. Not only that but the "winner" was also out but wasn't called and Djokovic didn't challenge.
I don't think he had actually let go before hitting the ball, but he still should have lost the point in 3 different ways but somehow won it.
It was somehow fitting that the match ended on an ace that Edmund wanted to challenge but had none left, and from Djokovic's expression he thought it was out too.