I'm sitting here at work thinking, "where is the breakdown in communicaion in this thread?" I think I figured it out.
I keep saying the chair umpire can't make the medical decision as to whether the trainer should treat right then and that the chair umpire can't decide whether it's acute or not. You simply have to read the rule exactly as it is worded. This is the best way I can think of to exactly get the point across that the rule was followed.
I think the 2 most relevant questions in this thread are, "Why did the chair umpire call for the trainer right then?" and "Why did the trainer actually treat him right then?"
As I said, you need to read the rule exactly as it is worded. The most relevant part to the first question (Why did the chair umpire call the trainer to the court at that time?) is:
Only in the case that a player develops an acute medical condition that necessitates an immediate stop in play may the player request through the Chair Umpire for the Physiotherapist/Athletic Trainer to evaluate him/her immediately.
They player can request that the trainer come out anytime if the player thinks he has an acute condition. The rule does not say that the chair umpire can deny the trainer to come. This is where the part comes in about the chair umpire not making medical determinations. Imagine if the chair umpire were to say to Nadal, nope, you're running fine, play an entire tiebreak, then you can see the trainer. If Nadal did have something seriously wrong, and the tiebreak went long, or even short and Nadal made his foot worse, that would be really bad.
Now for the second part (Why did the trainer treat then?)
The Medical Time-Out takes place during a change over or set break, unless the Physiotherapist/Athletic Trainer determines that the player has developed an acute medical condition that requires immediate medical treatment.
I have gone in detail about this that the trainer obviously thought that this was a serious issue that needed to be addressed right then.
I wonder if that is a better way to explain it.