I was never a FJ display pilot so can't and unlike others here, will not, comment on 'displaying' different types consecutively. Most of us have been rated on two types of the same aircraft and flown them concurrently. I have certainly had to concentrate hard at critical stages of flight to remember which aircraft I was flying. A Hunter (never rated) is obviously completely different to a JP (rated). Can't see how you could get mixed up. I frequently flew four completely different types, single piston, twin turbine (two types) and heavy four jet. This is however a different case all together you don't get mixed up between a single piston and a heavy four jet, no one to serve lunch for starters.
No one will ever know what AH was thinking when he performed that manoeuvre. Including him.