Almost the Heron's downfall

I was watching the Heron on the Weir on the Avon today as usual.At first it stood on its normal place but gradually you could see it was getting rather bored!
   It was then seen to paddle out across the rather fast moving waters of the weir.Obviously looking for a better fishing spot?
  It then took a bit of a stumble but luckily regained its footing and flew back to the safety of its old spot!