I think Efren is less reluctant to shoot masse shots than most. I've heard that when he was left frozen or nearly frozen to a ball on the foot rail at one pocket with the shot pointed at his opponent's pocket, he just played a little masse shot, circled around the object ball and brought the cue ball back to the foot rail on the other side of the object ball so the balls then pointed at his pocket.
It's on youtube somewhere. Ernesto Dominguez showed me this shot in Taiwan once as well. We were all at the pool room and he started doing a bunch of little masse' shots like that which were all very cool.