Thanks! The end of your second video clearly shows an access door on the north side of Building 1 into the fully enclosed “courtyard” surrounded by the two breezeways and Buildings 1 and 2+3.
If you are anyone else is doing any further drone surveys, I would examine that area closely. I am not sure this escape route was actually used - perhaps the shooter intended to take that route but was killed instead, or perhaps a second shooter did escape that way.
