The questions were determined by Wallace.......so all he had to do was watch Joes interviews and compose them based on what Joe was familiar with...which is why Bidens answers were exactly the same as he’s done prior.
Or he has been getting the rote answers pounded into his head.
You need to knock him off his feet. Trump needed to ask him questions. Trump needed to press him on his lids. Trump needed to make him embarrassed in front of the US for not taking unscripted questions.
That would be my next tactic. Go after the scripting. Biden was losing it at the end. The best tactic is to irritate him after he rambles. Make fun of his rambling.