It's likely because they knew that if he entered protocol when we played them, he wouldn't have cleared in time for the Thursday night game. Which ended up the worst possible way for him.
You look at what agahlor did to stop the play when he knew his teammate was out on his feet and then you look back to that week 3 game of tuas teammates helping him barely stand up.
Win first, health second mentality comes from the coaching. McD doesn't even let healthy players play because he worries about their long term well being.