Go to http://www.esnips.com/web/WytnoiZ and look at the image towards the bottom of the page; select large view. This occurred during one of my games. Can you figure out how this is possible? I can think of only two ways, one of which happened of course.
I take it you are referring to having only a wild ball on a line?
I am being a bit slow tonight but I can only think that if perhaps you shot a wild ball immediately after a colored ball that cleared the line but the scarab hadn't cleared yet?
Nope, that's not possible. It happened to me like this: I shot it to the end of a line to perform the "change to single color trick". Soon after, I got the sandstorm bonus. If I remember my Lux 3 dox correctly, this takes out the bottom 50% of balls on the screen. Well, guess what? The %50 ended right before that ball! Just a chance occurrence! I was shocked, but was able to pscreen it for future reference.
The only other way it could possibly happen would be same scenario, but you triple up on black and the "Shredder" comes out (my name for the scorpion)...he stops after a set number of balls, so I'm sure could happen that way as well.