Catcher makes a sign -> ????? -> info is relayed to the batter.
What's happening in ???? exactly and where does the Apple Watch come into play?
Player batting can see his own dugout or his own third base/first base manager and easily receive a signal from them.
As is now all major broadcasts easily show the catcher's sign and it can easily be decoded back to his pitches. Without the use of cheating you could only really get the signs today by having a player of your own on second base.
Catcher makes a sign -> someone watching video electrically relays sign to dugout (in this case the athletic trainer who was receiving the info using Apple watch) -> info is relayed to an injured player on the bench (probably verbally) -> info is relayed to an outfielder (I guess who is a runner?) -> outfielder/runner relays information to batter with yet another set of signs.
Oh and all this was apparently going on without the knowledge of the manager or front office.
You don't need to use an Apple Watch when a runner is on second- they can see the signs directly from the catcher, that's why catchers put down multiple signs with a runner on second. When there's no baserunners or baserunners on first or third then the catcher typically uses just the standard signs and only one. It sounds to me like the sign stealing was going on when the "standard" signs were being used, I agree the article is confusing as to what is going on exactly. SMS doesn't sound fast enough for this purpose either.
[In baseball everyone is giving everyone else signs the whole game, it's how everyone communicates with each other to execute plays. Players need to know what other players are going to do to be able to work as a team. ]
Slight nitpick; the players in the field at a given time aren't on the same team as the batter, so the outfielders relaying signs to the batter doesn't make sense. However, Holt and Young are not starters for the Red Sox, so it's more like that one of them formed the part of the chain in between the trainer and the batter rather than an injured player and a fielder.
Wouldn't have been too hard to insert that fact in the beginning, this is not a novel of suspense and mystery...
It's actually critical. Sign stealing is not illegal, although frowned upon. However, FTA:
>Binoculars and electronic devices are prohibited to communicate about signs.
The video replay personnel are sending messages, via Apple watch to the trainers.
http://appleinsider.com/articles/15/08/19/mlb-okays-apple-wa...
>While there is no official rule against electronic devices, then-MLB operations chief Sandy Alderson effectively laid down the law with a memo distributed in 2000:
>Please be reminded that the use of electronic equipment during a game is restricted. No club shall use electronic equipment, including walkie-talkies and cellular telephones, to communicate to or with any on-field personnel, including those, in the dugout, bullpen, field and-during the game-the clubhouse. Such equipment may not be used for the purpose of stealing signs or conveying information designed to give a club an advantage.
[0] http://www.kctv5.com/story/29888526/kansas-city-company-repl...