User blog comment:TDFanatic52/Top 10 Biggest TD Moves/@comment-11883116-20161018024102/@comment-11883116-20161018025441

He'd make Duncan suffer anyway. And there was still a chance Duncan would also want to figure out who voted for Courtney (although he didn't). It's also possible Courtney would also believe Heather was somehow responsible for Duncan's elimination, like Duncan did in the real version prior to finding out the truth.