Watching Trump at this Commander in Chief forum gives a clue as to what he's going to be like during the debates: Basically, every time Matt Lauer asks a question, he swerves immediately to another subject. He goes to his by-now-well-memorized talking points: jobs being lost, Hillary's emails, Obama's weakness, and of course, CHINA.
So that could be what HRC can expect: any question asked can just be brushed aside, with bromides, anecdotes or just answer a question that only the voices in his head are asking.
Basically, Hillary should get used to saying “You didnt’ answer the question Donald”.
A LOT.