I was in Socorro in Jan and here's how I did back rolls with a camera. Fold the strobe arms in and tether it to a D-ring on my shoulder strap (just in case). Pull the camera into my chest with left arm and wrap that arm around it. Further hug the camera with right elbow and bicep. Right hand on mask & reg. Worked fine for me and I think I'll continue to use this method for all back rolls instead of having the camera handed down.