What were you wearing? 212's?
Not sure actually (had a look for a number and the only one I could find was 245, but not sure whether or not that's relevant).
X-Talons + wet rock = bum-plant :(
Wet sloping bitumen and white paint will also do the trick.
I've had a bum plant on a wet sloping concrete driveway, and wet tiled (level) footpaths might as well be a skating rink. Inov8 soles are meant for off-road, not on.