Ashe was popping off on the point as the game teetered in overtime, when they decided to send their ultimate. It looked like it was going to be wasted, as most of the enemy team was wiped, and the progress bar was ticking down. But an ulting Zenyatta came flying around the corner.
Then suddenly the ultimate was perfectly timed.
Zenyatta is a great delaying character and if he had been able to use the full-timer of his ultimate, his team would have been able to respawn and continue to pressure the point. However, as Zenyatta turned the corner, BOB knocked him in the air and out of the point, allowing for the progress bar to fill up and finish the match.
Even without the BOB ultimate, Ashe was popping off, but that little bit extra sealed the deal.