I'm reading Eddie Hapgood's autobiography, written at the end of the second world war. This is a great little piece from the first chapter, an article written by a Kettering paper covering a friendly match between Kettering Town (Hapgood's first club) and Arsenal (Hapgood's club at the time).
"The next time I go to see a match on the Rockingham Road ground at Kettering, I shall insist on being accompanied by Sherlock Holmes, the 'Big Four' from Scotland Yard, and a leading member of the British Magical Society. Though I have no intention of causing any undue alarm in the camp of the faithful followers of the Poppies, I feel it incumbent upon me to warn them, at the close of a thrilling season, that the green patch which covers the playing area conceals a treacherous quicksand, wherein players disappear and are never seen again.
Kettering were entertaining the Arsenal in a friendly fixture, and, with the exception of a goal or two that happened along in the first half, all went well (though I believe the diminutive Mitchell had some difficulty with his shorts - they seemedto fit too tightly around his ankles). It was after the referee blew the whistle for the refreshment interval that the tragedy happened. Two strapping Arsenal players - David Jack and 'Happy' Hapgood - vanished into thin air. Presumably, the quicksands had swallowed them up, not even a tuft of hair could be traced, and the crowd stood aghast when the Arsenal re-started. No David Jack; no Happy-go-Lucky Hapgood.
In their places appeared two substitutes, mysteriously recruited from some sort of Arsenal 'pool' held in reserve (like a battalion in billets) somewhere behind the grandstand. People wondered; they whispered in queer undertones. What happend to Jack? Where was Hapgood?
If there had been anotehr adjournemount before the end of the match, I should not have been surprised to see the Arsenal team re-enter the arena with a brandnew forward line, three halves borrowed from the Scottish League, two backs from West Bromwich, and a goalkeeper on loan from Newcastle United.
I was beginning to wonder wheter the police had authorised the issue of the usual £500 Reward notices, when a powerful voice nearby informed the world that Jack andhis friend had merely dropped out to give two other Arsenal men a chance to kick the ball!"
So, in summary, you don't see fans in total shock or surprise when a substitution is made when there is not an injury present. Subs are seen, not only as a part of the game, but an absolutely integral part today.