It's a universal rule that even after all these years, everything looks cooler in bullet time. Time stops! Perspectives get reversed! And when this dude is breathing fire in bullet time, it looks like a maniacal orange fiery beast is being excised from the guy's body. It's a really bad arse look.
Mitch Martinez, who made the video, breaks down the setup:
48 DSLR camera array + RED Epic (120fps) and GH4 (96fps). No CGI Animation or VFX.
All imagery in this video was created in-camera.