I don't know about all that WCP just that from the late 60's I have never heard other than applause for a player who has had the misfortune to be stretchered off whether ours or theirs. Not whinging about the other stuff. Ps I obviously edited my post because it was going off topic.
No they didn't. It was when a player was being treated and Before anyone knew it was serious. If a stretcher was called for the crowd would always applaud a player off.