He made a bad mistake at the first and seemed to lose his action so Ruby decided to pull him up.
Disappointing as it was at the time you have to commend Ruby Walsh as the horse could have done himself some damage that would have been made worse by continuing in the race.
He was well fancied too being backed in from 10’s to 5-1 and my bet of the day.
Hope he is soon recovered and back on the racecourse again. 
Things turn out best for those who make the best of how things turn out...