You know we still have pretty much no idea what's really going on. There's no reason to take The OA (the character) at face value beyond she got her sight back, and that the interpretative dance was just weird enough the shooter may have paused simply because he thought WTF. I don't think we even found out the shooter's identity.
That's the best part. The dancing was obviously a distraction for the shooter, which is why he paused, and the dancing didn't compel the actual hero to intervene. I don't think the shooter matters, to be honest.
I just want more of that sweet, sweet backstory. lol