>> circular sleds for winter recreation
>> make great retro-reflectors for their sound assault :P~

> is what is posted here true?

http://www.unmuseum.org/burning_mirror.htm

Works, with compatible frequency range, and would be rather difficult
to maintain aiming and focal distance in the chaos of a street protest,
but fun to think about.

https://en.wikipedia.org/wiki/Active_Denial_System

https://www.reddit.com/r/ProtestPros/comments/gye1j1/if_youre_protesting_please_beware_of_long_range/ftclmsj/
https://www.reddit.com/r/AntifascistsofReddit/comments/gy4n30/if_youre_protesting_please_beware_of_long_range/