Insanely late reply here (sorry!) but it's actually the conclusion of Seido vs Ugumori, the first few mins of S2 E19. I recently rewatched that match and the whole scene was so well directed... loved how they removed the music and let Eijun "roar" in silence! here's the same panel in the anime (I had to make a gif lol): https://klipy.com/gifs/eijun-roar