Clinton has a history of going ballistic when criticized or challenged. Trump needs to go after her rather indefensible record. This will most likely result in angry outbursts throughout the 90 minutes. It will show that she is the one with the poor temperament, plus highlight her failures.
A shrieking old lady won’t come across well on TV. I think she’s gonna be so laced with medications she’s gonna look like a talking robot up there. The visual won’t be kind to her.