Yeah, that was my thought too. One guy came pretty close to getting shot. Reminded me of that video that came out about a year ago of those lion hunters getting charged. Unprepared hunters, lots of screaming and panic, and some errant bullets flying.
There can be too much of a good thing with antler rattling.
I like to hit the horns together for a good 30- to 40-second rattling sequence and then hang them up and resist the urge to hit them again.
This works to the hunter's advantage, because if a buck has heard it, he may have been 300 or 400 yards away and he comes in and he's not exactly sure where it came from.
When finally is time to rattle again throw a slight change-up into the routine.
The second time, don't rattle as loud...