I followed the link you provided.
In the following section about one of Steve Squires patents:
Modular autonomous perimeter security and non-lethal defense system
WO 2006093527 A3
Abstract
it says in part,
"responses can be delivered in the form of lethal sound or lethal weapons."
At first, I thought "a lethal sound?" MAN that's gotta be LOUD! How can that be?
Then upon further thought, I recognized sound is just atmospheric pressure waves detected by our ears .
So... In that vein, the shockwaves from high explosives that burst human flesh daily in the Middle East really are nothing but "lethal sounds".
You are an ongoing source of insight for me. Thanks!