Unlucky buddy.
Here's the same pic with the Stemmon's sign outlined.
We can see plenty of the space where the gates should be but there's not a diamond in sight.
This is photographic proof that the gates were "wide open" at 12:40pm.

It's a bit like this Dillard pic that was taken long after the shooting was over, it almost looks like a different day, but in it we can see the big empty space where the diamond patterns would be if the gates were closed:

Unlucky Royell.
Not even you can argue against solid photographic evidence.