Some of my contributed FX works regarding Dragon's Breath with Real-time fluid simulation. (Rendering Engineer is Masatoshi Matsumiya.)
About 4 player’s online, it was not split screen, They have used four Playstation4 when they have shown this game-play on Tokyo Game Show 2013. But it definitely worked on PS4 (not PS4 pro) as real time Fluid Simulation Effects.
(2013) Real-time Fluid Simulation on PS4