I will also remember I thought for some while the problem was with the engine and couldnt understand why in spite of everything appearing normal I was descending at an alarming rate. Of course everything was normal! (at least so far as the engine was concerned).
I had the same feeling. Checked full power, checked mixture was fully rich, checked Ts and Ps, checked RPM - all normal for full power, but WTF are we still descending?????
That was I think what really shook me about the whole thing.