This article suggests hearing protection (ear plugs) against hearing damage, and dodging perpendiculary from police or vehicle to escape the beam.

On the topic of speculative countermeasures, possibly a water based system could help. NASA uses a Deluge system, essentially spraying water at the noise to scatter and absorb it.

Would probably require quite a lot of water, maybe a hose, tank, hydrant or similar.

If vibrating eyes is true, the noise is probably in the 30-80 Hz range, somewhere like an idling truck engine or a higher end subwoofer.

That type of noise is rarely heard by ears, but felt as vibrations in the body, and is mostly registered as physical discomfort and stress. At volume it would probably be enough to be very uncomfortable, but not necessarily immediately dangerous, it’s probably on par with working in a large engine room.

Hearing protection will help filter any accompanying noise, and should help keeping your head clear even under the added stress. It will do little to lessen the low frequencies.

Low frequency noise has to be reflected through considerable mass and/or stiffness. Think walls or three pane windows, but also human bodies. Maybe forming ranks and rotating members could be a useful tactic?

Sound has to cross all of the mediums they propagate through. At every change in medium, some sound will reflect. The reflection is greater the bigger the difference in mass and/or stiffness.

For regular, spherical spread sound a lot of it spreads widely and laps around edges (like waves around a pier, a bit flanks around). For narrowed/concentrated waveforms, this is lessened.

Thus a barrier stiffer and/or heavier than air does make a difference, about 3 dB per doubling of mass and/or stiffness, a riot shield will probably give you about 10 dB.

The effect is higher if you do a double barrier with air in between. A two-pane window can easily do 20 dB. Probably the same with a two-pane riot shield.

Observing groups is a very useful skill, in minutes you can tell who’s where in the hierarchy, what the cliques are, how well they coordinate, how information flows, and where influence springs from.

This let’s you not only insert yourself at the right moment, peg, and place for maximum efficacy, but also informs you of barriers, challenges to overcome, and next steps for the group to act better together.

Hobby/skill/interest in Group dynamics, useful for coaching, creating community, project organisation, and group coaching.