I'd like help to find a scene that I remember, but I totally forgot where I saw it. It's probably from an anime (and if it's that, it would be from an OVA), I don't think it's a film (though it still may). The set is quite futuristic, but guns still use bullets and the future doesn't seem very bright.
During the scene I'm talking about, the main character, female, is about to be shot by the villain, maybe some army guys? The main male character slowly falls upside down and shoots the bad guy before he could do anything. This is pretty much all I remember.