I have a widelux...I haven't seen Jeff Bridges' photos though I have heard of his work...that's the caveat...

The slowest shutter speed is 1/15 sec. It takes longer than that for the slit to travel, but not a terribly long time. So, could you do the run around thing? Probably, as long as the pictures are super close-up. But the other thing is...I suspect you could just arrest the shutter midway, move the camera, and then let it go. If you just put your finger in the shutter slit when it gets to a certain point and hold it there, I suspect you could do it. I'm not going to go do that with mine because I like my camera and am not sure what the effects of such treatment will be...but I've had to do unkind things to it to get sand out...and that's the basis for this comment. The shutter mechanism, since it is all mechanical, can be mechanically interrupted and messed with.