Ah like a click sound when the clip is emty, i am not a gun expert.
Before release i did find that you can get pushed off but that's only possible if you start from the previous save (so the player talks before dunka spawns), and because your off and dunka dosent despawn you can just shoot him infinitly and finish the boss way faster, interesting (so far i havent seen anyone clip off)
and yeah, hit indicator for boss 2 would be really helpful and make his health less, because that can take minimum 2 mins and up to 10 mins for people
i tried a lot of new things with this game