In times of uncertainty debt becomes an issue regardless of...

In times of uncertainty debt becomes an issue regardless of serviceability (look at FMG).
You have to remember that debt is held by an institution that can withdraw support at any time. So the fear is that should an institution come under pressure it can sell debt to a third party or call the debt in.

So companies with large debt come under pressure regardless of fundamentals.

I see this as a buying op therefore because if you assume the sky is not falling in then this is a temporary issue.
Ounce markets stabilise debt becomes less of a concern and the share price should recover as the focus will shift to earnings.

Also, stock now is at good support level going back to dec 2015 then all the way back tp Dec 2014.