Did two laps in the same general vicinity on west scotties. First lap noted no instabilities on the slope we skied, but noticed some wind slabs on the way up. Second lap the sun had come out, and triggered this slide. I was the second skier, and failed right where my partner had turned. It seemed to take a pretty big, or repeated trigger to get the slab to move. It failed at my feet, and was slow moving to start, but picked up a good bit of steam and ran a few hundred feet. The bed surface was still soft, so we assumed it was a wind pocket, or could have failed on a density change in the new snow, that became more reactive with a bit of warming.