The problem you have here is that the known distance of 400 yards to the Mandalay Bay is accurate to the sound of the rounds hitting the ground per the forensic analysis done by the individual on the video Peke posted. So if that were correct, one could assume that the other would be as well-the 215 yard range. The individual that beforehand said 'you're all surrounded and are going to die today' right before the shooting is also a highly unlikely 'coincidence'. Yes, you had someone say that before at a concert you were at etc etc, but there was nothing following that that also confirmed what the individual said. Personally, I've been to several concerts and never once have heard anything of the sort mentioned. It's not a common occurrence to be told 'hi, you're all dying today!'.
There were how many people there at the concert? Are you suggesting that this mythical person told ALL of them, "hi, you're all dying today!"? And are you really confident that the concert goer(s) who claim they heard got it right?
And now, assuming that someone actually did hear it, and that they heard and have reported it accurately, AND that the reports of what they heard and reported have been accurate..... such a comment would only be meaningful if the person saying it actually knew something about what was coming.
And please forgive my laughter if you can hear it where you are, because I am laughing pretty loudly at this, if the person actually knew something about what was coming, that would mean that not only was there a conspiracy, but that one of the conspirators, in a plot which would carry the death sentence for anyone involved, was wandering around mentioning things in advance to absolute strangers and running the risk of causing everything to fall apart at the last minute.
Ooooooh, yeah, that one sure sounds convincing to me.
You are much less likely talking about a "highly unlikely coincidence" than you are talking about a wild nutjob fantasy.