Not the best analogy, but I've been to a few IPSC events in my day. Specifically the handgun/timer events. If you want to see someone melt into a puddle. Give them a difficult task under time. I've seen guys that looked as clean and smooth as I've ever seen, immediately become discombobulated and lose all coordination. Their prior skill went right out the window. Even seen guys unable to holster after firing. That timer just wrecks people. Or hunters, we all know about "Buck fever". Your hands start shaking. You can't focus, aim, or do much else. Adrenaline is a bitch.
The point being all "mechanics" go out the window in the face of immense pressure. It takes time and exposure to control in. You can't simulate it. You just have to inculcate yourself as best you can.
2005 Vince went into the horseshoe and pulled it off. 2003 Vince, I highly doubt it.
I'm not about to give up on Arch, but Sark needs to make the proper adjustments to put him in the right place with the right plays. And get a fucking O-Coordinator already.