Here's what happened (painful but instructive): Don flies with somewhat questionable gear, and in this case one of his lines broke right at the crimp, at the handle end. His plane (Ringmaster) went into "endless loop" mode, flying on just the up line. The broken down line had wrapped itself around the up line, within reach of the handle, so rather than let the plane pancake in at the bottom of a loop, Don thought maybe he could get control by grabbing the broken line. Bad idea!
He grabbed the down line with his left hand then instinctively took a wrap of it around one finger. At this sudden change in control, the plane got into the wrong attitude, came in on the lines, then flew back out of the circle with a jerk that nearly cut the end of his finger off. Ten stitches, could have been much worse.
Makes my finger hurt just thinking about it.