Which I doubt is the case, otherwise it is most likely he would of kept sliding after the runway ended until he hit something.
-The Dora doesn't loose speed quickly, it retains it quite well.
-The Dora can slide a very good distance down the runway, especialy when light and with full flaps (or no flaps) down and with both wings attached.
Often times, when I have to land gear-up in my Dora, I will at some point (before I get too slow to loose most/all control from the surfaces) in the slide on the runway, intentionaly turn it 90-degrees so it will come to a faster stop at a place on the runway that I choose. Otherwise it is very easy for it to slowly slide down the runway, to a point where you have almost no control because not enough air is passing over your control surfaces, while it will often still have enough E to slide just off the pavement to the sides of the runway.