Oh, I figured out how to knock and fire. It's the aim that I'm having trouble with. The blue mushroom helps me find them after I've shot them, but as far as seeing them in flight it does not help even at night. I tried out the rapid fire though and it has helped me take down fornicians without having to rely on the blow darts.
Could be I'm just not a ranged person in this game, which is different from how I usually play.
And as a side note, I was doing really well. Made the longest run so far, decided to explore the mountains... Got lost and died. Like, I swear there were pools of water and stuff every time I was starting to get worried, then somehow I found the one spot that was super far away from everything to camp. If I'd had the glider I would have been fine... I died ten times trying to find my way out. It was hilarious all the different places I found to die, and terribly frustrating that I didn't have a save outside the mountains. Eventually just gave up and started over. Live and learn. Or die and learn...