If a player is standing against a window pane and you were to shoot the other side of the pane you can shoot the player on the other side

Me and my friend were messing around on our server and he was standing in a window made of panes. for jokes i shot the glass and he took damage from my bow.

1. create a 2x1 window surrounded by blocks.
2. have a player stand on one side of the pane.
3. have another player fire a bow at the player