I wasn’t there to hand out the exam but from what I heard this morning, something horrible happened. I don’t think the honor code will be able to fix it and make the test “fair”. If anything, a new exam should be rescheduled. But what do I know, I’m just a TA.
Addendum: If you happen to be a student taking this course (and even if you’re not a student taking this course) and you’ve stumbled onto this website by accident, I can’t tell you anything else. Maybe after the term has ended. And if you’re a prof and you’re reading this, you can probably guess what happened.