If there actually is a debate, which I doubt, President Trump should be careful to not trounce feeble ole Joe too badly because that might backfire and give Joe some sympathy votes for being laid to waste and embarrassed on TV.
Joe simply can not ad lib, he is 100% a script reader and he does OK as long as he sticks to the script but, as we have seen, when things change up Joey becomes frustrated, angry, begins lashing out and jumbles his words.
I would not be surprised to see Joey pull a...
https://www.youtube.com/watch?v=lj3iNxZ8Dww
Which is why his puppet masters will not allow him to debate.