The funny thing about this, if this can at all be called remotely amusing when you consider the unfortunate demise of the original pilot, was that during my first lessons, I regularly thought: what will I do if my instructor suddenly collapses - he was 78, after all.
I was extremely nervous at that prospect so to hear that the passenger, who had never flown such a plane before, successfully landed it (and didn't look too badly damaged either), then a big "congratulations" is in order......