Human error, i brought a wet ladder onto a polished floor, i only stood on the first run to reach above a door to wipe off a squeegie mark.
Without warning the ladder feet slipped out and took my feet with it.
In 12 years of window cleaning, the ladder has never slipped out whilst i have been stood on the first run, even on a wet floor
even following all H&S procedures, it woulndt be unreasonable to expect the ladder not to slip out, even with the wet floor given my 12 years experience.