That's extremely unusual, as you clearly know. I'm not the expert you are, but I've read certainly a hundred of these accounts from several writers, and this is the first time I've seen this.

Seven seconds sounds short but it's a long time when you're fighting for your life.

Pilots are trained to communicate airplane status at these moments, and when the training fails, people start to pray or swear or cry or some combination of these, god rest their souls.

Normally you'd expect a pilot to spend about a second being surprised before reacting. Even if they "froze" that might be only three seconds.

And there were three people in the cockpit, am I right?

And yet the sound of the proximity warning is on the tape to the end (do you know that for sure?), so it isn't a super-impossible coincidence of the mic failing for no reason (because nothing was wrong with the plane except its location and heading at that point).

Bizarre. Inexplicable to me. And of course, it's very unlike there will ever be more information.