I think fnshtr is basically right, but I'll expand on one or two points. Probably your friend was using the dead, or static release. Rick Welch also uses and teaches this release. It works for some people, and not others. Rick definitely has a gift, but it is teachable, at least to the extent of one's own gifts and willingness to practice and learn.
I would disagree with one thing fnshtr said, about Rick relaxing his fingers, wrist, and forearm at release. I'm pretty sure Rick's wrist and forearm are as relaxed as he can get them during his hold, and the only thing he does on release is to relax his fingers and let the string push them aside. I would agree with fnshtr that Rick's hand flip is probably due to the degree of relaxation in his hands and fingers when the string pushes them aside. At one point during my last class with Rick, when I was in a particularly good groove, Rick commented that I was relaxing my hand like he did, so it flopped down on release. I can't do that all the time.
In a dead release, unlike a pull-through release, there is no increase in back tension at full draw. Once full draw is reached, the back muscles are locked off, like you would lock your muscles off to hold yourself at the top of a pull-up. The secret is to maintain the back muscles locked while at the same time relaxing the finger muscles to release the shot. This is probably the most difficult thing about a dead release to learn, just like the most difficult thing about a pull-through release to learn is to steadily increase back tension through release, without losing any back tension when the fingers are relaxed. Any decrease in back tension, under either method, will result in creep or collapse, depending on how much back tension is lost. I've read commentaries by experts saying that everyone creeps to some degree, so the goal is to minimize, rather than eliminate it.