A diabolical decision and all thanks to the BHA endless tinkering with the rules.
Had that same incident occurred to any of the rank outsiders in the race would the stewards have reviewed it and deemed it a non-runner? I don’t think so.
In fact 80-1 shot Poker did stumble out of the stalls and almost unshipped his jockey so should he be a non-runner as perhaps there was a patch of false ground in front of stall 4?!