I've had people literally rip me a new one when I tell them I don't look at my bag coming off my back. My mechanism works like this:
I look, wave, throw and then the clocks starts ticking in milliseconds. I know by the timing if something isn't right. If I don't become vertical within 2-3 seconds, I look up and see what is going on behind me.
Anyone agree?
"If you're going to be stupid, you better be tough!"