They played exactly as anyone who's watched a Bruce team before would expect them to, keep it tight first half and hope for a chance on the counter then give it a go with percentage balls into the box for half an hour and if it hasn't worked go back to the tight defensive shape and hope to hang and maybe sneak another on the counter. By backing 5-10 yards deeper they gifted us the game because Grealish, having struggled to control the game until then, suddenly started bossing things and we ripped them apart 4-5 times in the last 10 minutes, with the 2 goals being a result of that pressure.
It exposed just how poor Bruce is because how could you work with Grealish for 2 years and not realise that letting him turn and get his head up is a really fucking bad idea. It's his paint-by-numbers approach to tactics that has led to him failing every time he's had a chance in the premier league and is why we didn't go up ahead of Cardiff or Fulham last year.