Even with cue cards he made no sense at all. I cannot imagine him doing well tonight even if he has someone talking into an ear piece telling him what to say.
I agree - for someone in his mental state, repeating words while simultaneously listening to the next ones will be nearly impossible to sustain for more than a few seconds. Probably even more disorienting than trying to talk while hearing a strong echo of your own voice. Like simultaneous translation - takes many months of practice to become good at that.