What?
I have a roller on a mullen mouth snaffle. It’s for the horse to play with. Horses enjoy playing with the cricket on a spade because it acts kind of like a fidget spinner and keeps the mouth wet with light saliva. I’m not sure what you mean by “working the tongue”, but you generally use a roller on a sensitive or nervous horse, not as punishment or to increase pressure on their tongue, but to help reassure them. Sometimes, on a horse with sharp bars, it will help give the horse more surface on the tongue so that they can lift the bit away from the tongue.
In the Californio tradition they are used as signal bits, and of course you would never see a blue tongue in a spade. I’m not sure where you’re going with this, but the use of the spade mouthpiece is to sit on the tongue and when the shank is touched at all, it lifts off of the tongue, giving the horse the signal to yield to the bit. You are never ever ever supposed to let it contact the palate, if you have, you should be beaten with your own romal reins (as per my old cowboy mentor). In fact, you don’t even put a horse into a spade until they are riding 99.999% off of your body and light as a feather in the bosal/bosalito. Many horses don’t ever earn their spade bit and instead move into a regular curb or half-breed. Do some people misuse them? I’m sure, because sometimes people get confused or hurtful, but that is not how you are trained to use them in the tradition.
But maybe that’s not what you’re talking about and I’m just completely confused. No idea why the spade was brought into the conversation about Werth’s blue-tongued horse.
I actually think most of the blue tongues that we see come from snaffle pressure combined with the extreme head position - some of these horses don’t have necks that look like there’s a lot of space in there for vertical flexion. That would make it easier to create the conditions under which a blue tongue might emerge. But it IS wrong no matter how you slice it.
Of course some of these GP horses are difficult and sensitive creatures. To my eye now, knowing what I know now, many of them look stressed/distressed. I’ve seen a lot of photos that are held up as “model photos” and I think to myself “yikes, that horse is extremely unhappy for whatever reason”. But the idea of dressage is supposed to be systematic training that promotes harmony and obedience, not “flash in order to impress the judges”. That DOES point to a judging problem and that has created conditions under which we are stressing the horses excessively for competition wins.
Let’s not deny that.
I don’t think it’s cause to cancel all competition dressage, and I don’t think it’s cause to crucify specific riders, but I think it’s something we should all be cognizant of and trying to improve. Pointing at other disciplines and saying “see they are worse” probably isn’t productive. All disciplines have their good and bad points, gentle trainers and bad trainers. All disciplines that have competition involved move toward the extremes and there’s a need to create rules to ensure that doesn’t happen. That happens no matter the sport - with or without animals involved. It’s a human thing.