They can tell in 1.3 seconds after seeing someone start to move their horse if they want to take a second.
Terrible of reiners to be so bigoted, is is.
Parelli would not pass that first look, he doesn't know anything about reining and it shows right off.
Parelli was a rodeo bareback rider and I am sure he can tell, first jump out of a chute, if someone really can ride barebacks.
Goes with the territory, no matter what you do, to know who knows what they are doing, who is bluffing.