Rag on Harden's D all you want, but he actually recognized the Blazers' play before they even started moving. He told Parsons and Bev to switch initially so Bev could switch back to Lillard after the screen. Teams do that all the time. You leave your best defender as a second option to pick up the best offensive player in the event of a (pretty much guaranteed) screen. The second switch just never happened and Lillard was left wide open. Jones shouldn't be guarding the inbound, but even in his position, he could at least have kept an eye on the Blazers and moved towards the passing lane. We were defending with 4 people basically.
here's a link to a youtube video of mchale telling them to stay with their man. they aren't switching anything. https://www.youtube.com/watch?v=wNgf_-Yqu9c
