 You know, if you're there with a former sniper, the question probably arose that obviously the Secret Service counter-sniper team did a great job in taking out the shooter once he was discovered. But how did the shooter ever get to that vantage point in the first place, A, and B, why was that vantage point left uncovered? You know, if you cannot put a physical barrier between a potential site for a shooter to take advantage of, then you need to put a team on that roof to make sure nobody gets up there.