Factually?
2 stages.
Flash dominates Ferris Air craft, and Mess hall (arkham asylum)
on mess hall, the pig is yours, you can phase, throw it back, and then go for LS and do his slide. and throw the pig again for shenanigans.
On ferris?
lets just say, anything they throw at you, you phase, and every interactable on that map can grant flash 50%+ damage. I made a interactable combo video, check it out and you'll see what im saying.