There was also an incident at the second last fence.
A horse fell at it on the first circuit. It looked like he caused a dent in the fence. This was mentioned by the commentator on the second circuit, when the favourite made a mistake.
Then on the final circuit, the favourite refused from out of nowhere when seeming to be going well and with the race at his mercy.
I have to wonder if the horse was distracted by the damage to the fence. Should it have been dolled off, like fences are when a guard rail is broken?
A very unsatisfactory race, anyway.