>>63926787
air does not work well vs shape charges. i think you are mixing this up with medium transition propagation disturbance or what its called.

Going air to water will do more beam disruption that an equal amount of homogenous material. thats the part of logic behind sandwich armor.

The working mechanism is to large part warhead deformation, not stand of detonation. thou a FPV could tumble too and thus trigger at a angle .