[quote=@Disdain]
<Snipped quote by Source>

I cannot immediately discern how.
[/quote]

Volume is an important question in defense.

[quote=@Darlit Glitch]
<Snipped quote by Disdain>

I think he's talking about a literal physical barrier like a wall made of some real material, not a barrier made of energy or the like.
[/quote]

And logical defense through personal skill.