Random encounter in NYC Batman has his normal gear plus a Katana, Hei has his normal gear (Two short sword breaker daggers and the thing he shoots to climb) plus he can use all his powers.).
Round one is random encounter:
Round two is same gear but 30min prep and they both have a book with each others stats and information in it.
Both are to the death but batman can run to recover.
Little video of Hei fighting to give you a good idea (some people might not watch anime)