Rulancering. When there is upcoming fight, expect to be shot at. If they give you warning, warn them back. If id get shot, i would use my /l1 and pew pew!!
It all should be within roleplay, ID of the player and the situation. Simply saying near 50 % shields is like asking for where sanction can be filled. Cmon, shoot back ! its more fun and pixels.
On a serious note, whenever I do warning shots, I miss the ship by small margin.