Don't take this wrong way....just something to think about.
I'm assuming it's daylight as the FED X guy doesn't drop packages in the middle of the night. I would think you would want to take a quick look at who's coming BEFORE you line up the 3 dots on his chest.
It could have been a surprise visit from an out of town relative, the kid down the road selling magazines, your neighbor etc. etc.
Just sayin.......I wouldn't be so quick to put somebody in my sights.