I don’t think tracer fire coming from that much of an elevated position would have given him away for anyone to start firing back while getting shot at. Unless, perhaps, someone with a good rifle and skills was in another building, and not receiving fire.
How long did he shoot? Ten minutes?
That’s what I heard so that is why I think he popped himself after the security guy showed up. Or what was he doin for an hour? That’s why my thought that he was dead.