I've been recently working with an old non-linear editing system that has a few quirks. Sometimes, the system freezes making my stressful job even more difficult. I could either restart the system or calmly wait until it "unfreezes". The sound you hear - a voice saying "extremely difficult" - is the frozen edit system looping a part of the interview that I'm working on. 

I've learned that Instead of getting upset, I simply turn on my audio recorder, walk out of my edit suite, get a cup of coffee in the kitchen, and return with the hope that I can get back to work on my news story.

In this case, towards the end of the recording, you can hear that the machine is finally back to normal and I return to my job whereupon the full sentence from the interview unfolds.

I find it a bit amusing sometimes and, of course, I love the serendipitous nature of the audio glitch.

Recorded in Washington DC by Bill McKenna.