Say you own a car with a sophisticated computer control system. It is in charge of everything, from the fuel injectors and ABS to all the little dashboard indicator lights, even the ones you don't really understand. Also, your car has no windows and you rely totally on external cameras, controlled by that computer, to tell you where you are and how fast you are going. The suspension is so good you can't even feel the road, and you rely on the traction control system a lot.
One day you're out driving through town and the computer is, somehow, hit so hard by a rock that it stops working and you're plunged into darkness. Eventually the computer flickers back into life and the dashboard lights say it's OK. Would you then go and drive it as fast as you could along a twisting mountain road, assuming that the computer was back in full control of the visibility, the ABS and the traction control? Or would you, I dunno, take it to the garage first?
Our brains do everything; they are in charge of our every sense and action. If they get bashed they stop working for a bit. In fact if they get bashed a couple of times in a row without being repaired fully they can stop working properly permanently. Yes, permanently.
Spurs have been spluttering some pretty poor excuses since Lloris was allowed to continue, claiming they were satisfied that he was not concussed.
Let's dismiss this conceit. They could not know conclusively that he had not suffered concussion. For starters, I was watching the game and I am reasonably sure no-one brought a CT scanner onto the field to give him a once-over.
What they were relying on were questions to gauge his awareness and the limited physical examinations they could carry out (probably checking pupil responsiveness and looking for superficial evidence of injury).
This is like looking at our damaged car's bonnet and dashboard lights to decide whether it's OK to go for your mountain drive. The only practical way to be safe is to stop the car, take it to a garage and have a good old look at that computer.
Hugo Lloris, at the moment he was knocked unconscious, became a patient first and a footballer second. The doctors were, at best, guessing as to his brain health. But they relied on Lloris saying he felt OK, which is to say they relied on Lloris's brain correctly diagnosing an injury to itself. They relied on the lights on the dashboard, when it was the very computer controlling those lights that might have been malfunctioning.
Anyone who is knocked unconscious in a sports match should go off. Any argument that this is unnecessary is based on the needs of the team or the sport, not the patient. Football teams don't die or suffer long-term disability because a player goes off injured.