It's 10ball not one pocket, but it's a great shot. When John leaves Efren with an off angle combination on the 10ball, Efren manages to 'get lucky' on the shot
He played a rail first billiard into the ten.
The real brain freezer is not that he made it, it's that he saw it and knew that it was the best choice. That's experience!
The main thing is that he took the time to look at the shot, something every one pocket player needs to do before your turn. Once you look at it, it is an obvious shot.