Pretty cool that you didn't go for the cliché "both pistols pointed along the flight axis" type of pose. Here it looks like Castle got kicked out of the window before he got ready to defend himself, depicting him correctly as the vulnerable Superhero who does take punches and bullets, just like John "Die Hard" McClane.
Love the two human shapes on the sidewalk, btw. They're just weird shapes but still you see two guys starring up at the window. Your suggestion coupled with my imagination!