There is one fairly simple answer to this that is really tough for some people to get on board with, but it's probably true in basketball more than any other sport: basketball is a game of matchups and Coach Larrinaga and his spread you out office attacks Duke at the heart of its defensive principals.
Duke loves to hedge ball screens and almost always defends over the top or fighting through. Unless we are way late in a game, we don't switch ball screens. If you aren't an elite, experienced defensive team, you're susceptible to being spread out and driven.
If you look back at all the games Coach L has done this to Duke teams, it's the same recipe every time. I've witnessed it twice in person - once in Miami against that 2014 Miami team that just obliterated us.
So you are saying somebody outcoached K? Hmmmmm some on here will defend this to the end or make an excuse