It was such a simple play. With respect, look at the position of the players on the field. The idea is that you have to stay in a lane - that is, cover a portion of the field.
As we talked about before, the guys on the outside are the fastest, and their job is to turn the guy in toward other blockers, or to make a tackle. The other guys have to stay in their area, or there's a space for the returner to go into.
In this still, who is to the right of the numbers? That's right. No one. And hence the kick return for the TD.