I can't remember what group I found this technique in, but it intrigued me. I had tried it before with no success. Apparently a flashlight just isn't good enough to get this kind of a shot. The off-camera shoe however is. I took about 100 of these shots. It is pretty much hit or miss with what you get. There is no good way to get the smoke to conform to what you want. After going through them I did get a handful of good shots. This is a series of the best ones (or at least the ones that appealed to me).