In the absence of hard evidence I guess I can understand wild speculation about what happened on the pitch, but that's not what we have here, so a lot of the posts in this thread make absolutely no sense.
Reporter: "Smalling could barely move, and he seemed to be marking McGuire, so they ... [inaudible and doesn't finish his question]."
Mourinho: "Yes. Yes, and I had the chance to speak with Ashly Young and to tell him the way the team had to be in position because of Smalling's difficulty; but I think lack of maturity, because I cannot stop the game and to give a team talk for the last few minutes. The players inside they have immediately to adapt and to read the game -- which they didn't."
Reporter: "Would you say your message didn't get communicated from the bench to the players -- they didn't manage to pick up on what you were saying?"
Mourinho: "No."
So, Mourinho did attempt to reorganize the team to cope with Smalling's injury, and he gave the message directly to Ashly Young. Young was inside the manager's box on the touchline, getting a drink while Mourinho gave him instructions at the 92:52 mark. Leicester City scored on the ensuing resumption of play.
Young was actually marking McGuire as the cross was put into the box, but once he saw Smalling track McGuire's run, he pulled up and let him run. Jones immediately turned and gestured at Young after the ball went into the net. Young whipped around and walked away.
And for all the speculation about Herrera's involvement in that incident, he said this:
"Happy Christmas to everyone, including the ones that try to invent stories that never happened #sofunny #trytobehappyanddontlye"
In fairness to the players, Jones did try to manage the situation on the pitch. So, maybe Jones' instructions conflicted with Mourinho's instructions inside Young's head, and the confusion led Young to not think clearly. I don't know. Maybe Mourinho saw Jones doing what a captain is supposed to do (he wasn't captain that night, but he's worn the armband plenty enough), which is why he waited almost 8 minutes after Smalling's injury to get involved. I don't know.