I can understand, sort of, why you would use those escalators at Knox - the lifts are ages away, not very well spaced out at all and if it's busy, you may well decide to take your chances on the escalator than push through the hordes of people in those narrow malls. Still, you'd want to make sure the brakes work and that you have a wrist strap (for a pram, a wheelchair on a wrist strap would cause some damage!!). How disturbing to see, though.