Ferny seemed clearly furious at being taken off against Leicester. I disagree we were being overrun at the time. The relative score change speaks for itself, that the change didn't work.
I also thought Ferny was great when he came on yesterday, one of the reasons we finished the game on top and wrestled the momentum from them. They were on top in the second half until he came on.
Yesterday we had 23 goal attempts but only 2 on target. I agree we should be getting more from Mahrez (and Sterling!).