I don't think we had the formation to take advantage of the man advantage at the beginning of the second half.
Credit to Koeman for trying to change it up, but it was fairly easily countered by City's substitutions and formation change. With hindsight - and it would very much be nitpicking - maybe bringing on Lookman/Mirallas to stretch the game and get another goal might have been better. Koeman was clearly trying to make it easier for us to keep the ball though, so you can't fault his logic. He was just let down a little by a lack of composure at the back at times, so Klaassen and Sigurdsson were never really in it.
In general though, it felt - even in the first half - that we were much more comfortable than the same fixture last season. Other than the goal, the only real chance they had to score was Silva's in the first half. Given how easily they dragged Baines and Jagielka out of position (a masterclass in movement and dropping off from City really), that's a great testament to how well organised Koeman has the defence.
Disappointing result given we were a goal and a man up, but sometimes you've just got to hold your hand up to a great opposition team.