Archerfish

I've tried numerous variations of shoot (whatever) and usually get the echo, you do not see them here, or something along those lines. Most recently I tried to shoot a falcon from the surface of the warf in Arkham. I tried: shoot falcon shoot "falcon" shoot 'falcon' shoot "falcon shoot 'falcon shoot a falcon shoot 'a falcon' shoot "a falcon" None of them worked. Is this skill broken or is there some stipulation that I don't know about to get it to work?