Gintama booom

A black-haired man in a dark suit stands in a dimly lit room with yellow-lit windows, then turns and walks away as a white-haired man in a white coat lies on the floor with a bloody face. The scene cuts to the white-haired man being struck by a glowing yellow energy blast, then to him being held in a headlock by the black-haired man, and finally to a red-haired man being thrown backward by a blue-capped figure.