Five remote interviews were initially scheduled, one per day over a week.

The first three went very well, but the last two suddenly turned very strange.

Interview #4:

The candidate cancelled at the last minute, delaying the remaining interviews until they could be rescheduled. When we finally met, he asked me to explain an obscure paper I'd never read and seemed frustrated and impatient throughout.

Interview #5:

The candidate seemed completely unprepared and asked me nonsensical questions about nothing.

It felt like they had found a candidate they liked and were intentionally sandbagging my interviews since they were already scheduled. It was a very disappointing experience.

Explain Epic's virtual point light paper.

Even though I never read it, and it was unrelated to the job or my previous experience, etc.