Very strange decision. Gabby was set and has a great record, cool head and technique. He looked very sharp on the pitch. Mahrez did not inspire confidence.
Penalties these days are a mind game. It's almost a solved problem. Striker waits until the keeper goes down. It's about vision, keeping cool being able to react and shape your shot at the last second. Mahrez had a reasonable game but he is nowhere 100% mentally at the moment. TBH I had Silva, Sane, Bernardo ahead of Mahrez. Probably Fern and one of the defenders.
As it's also unsettling to switch takers so late, it's a mistake by the bench.
What was the thinking? Give him confidence? Some tactical edge? Can't possibly have been his record.
Looks like maybe Pep flapped.