you can see enemy spies
You made me download and check my code
But I'm pretty sure it shouldn't happen. I'm going to actually play/test it, but really the bar should be as visible as the spies themselves -- which means it's invisible if the spy is invisible
Edit: just tested it, it doesn't show invisible spies. Maybe you have an outdated version, or your draw_set_alpha implementation is broken -- in which case it's your GPU and I can't do anything about it.
Well technically I could by removing the HUD on spies altogether, but there's no fun in that