Nuno who raped him clearly deserved a second yellow and should have been sent off. But it is what it is. After that Enrique wisely used stupidity of the referee and pushed Nuno to LW so he doesn't have to deal with Lamine no more and risk a red.
I agree there was clear lack of effort from his side. He was playing first 30 minutes after that like a fucking zombie. While it could be he was thinking about OF sluts as some of you suggest, the more likely scenario for me is effects of his injury are very much still there. Or team as collective simply used their fuel in the first 30 minutes, because it's not just Lamine who was underwhelming after that, more or less entire team.