It wasn't just Barnes. They were doubling and shading BI on every catch after his hot start. Credit to HB, but that was a team effort and a good adjustment by Jordi and Mike Brown. Really good awareness on their part. Ingram is a very good passer on the move, but not as much off the catch. So they limited his ability to drive and got the ball out of his hands early in the possessions.
The Kings definitely shot better after a dreadful start from outside, but if you take away Keegan, instead of 40.5% from three, the rest of the team still only shot 31.3% for the game.