There was something the Hokage was sure he had up his sleeve to wait like that. Some special ability? Genjutsu? A trap of some kind? Well, Kisame had walked into traps before just for the fun of it, so why not? Of course, there was a technique to walking into traps...

He charged, sword swinging.

And while that happened, the real Kisame started things off with a watery bang from a different area of the field. Flooding the area for a field advantage was never a bad first move.