scene is on a rooftop, it starts with the guy staring at the city and the girl appears behind him, he turns around and they both start showing serious expressions and begin to fist and kick fight each other. they briefly talk without there being voice overs or subtitles, in the background there is jazz music playing, kind of reminds me of a cowboy bebop soundtrack, and later on the guy loses his shirt in the scuffling. the fight ends with the girl pulling out a gun and shooting the guy offscreen, a massive explosion is seen from the rooftop they are fighting on from a distance. the animation is about 1-2 minutes long and was uploaded about 11-15 years ago, it accumulated a lot of views, 6 figure view count. the guy had silver/grey hair with bangs (like zero from vampire knight), and the girl had either brown or black hair, she was wearing short shorts. picrel is what I remember the thumbnail looking like. the channel who uploaded it also has an animation of a kitsune woman at an old shrine.