I've been wondering and browsing on obito uchiha (tobi) and He controlled the 4th mizukage. He is the secret leader of Kirigakure ( The Hidden Mist Village ).
I think that he controlled the mizukage as for his revenge for the Hidden Mist for as you guys know in the previous chapter. Rin and Kakashi were fightning The Mist Shinobis and were currently in danger. It was the stone shinobis fault for trapping team minato in a cave-in and they almost killed team minato by doing that but Obito didnt seek revenge on the stone village.