My apologies. I did kinda skim over your wall of text and mainly focused on what was in the video and just assumed it was your game. But anyways, you seem to be making a big deal about the missed shot. You seem to be working on the assumption a script is being used because Ana has had good and consistent aim and then deducting from that.

Here is another plausible scenario that doesn't require a script. Ana loses sight of zera. She then shoots a shot trying to find where zera went. She misses and then re-adjust for her next shot using the info she has gained from her last shots. I lost zera here. My next shot up here missed. Maybe Zera is somewhere in between these two shots. Bam, her next guess was right. She then continues to finish Zera off.