First, what an excellent point! I've had BTK on my mind for weeks now! This guy blended in like camoflage, no one had any reason to suspect him.
Having stated that it has struck me as odd that although he does attack from behind, whether or not these victims have seen him or not, they don't appear to be alarmed in any way.
10EC DAD:
That is part of my profile...Non-threatening, unassuming, sounds almost like this guy could be clergy of some sort.
Leviosa
That is interesting that you think he could be a part of the clergy. That is possible.