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I know Kontakt-V at least works primarily by the lateral movement of the plates sandwiching the explosive, resulting in multiplication of their effective thickness by several times and possibly the disruption of the HEAT jet and severing of a penetrator's point.
I'd imagine the reactive effect in BJ is just a disruption of whatever features of the offensive energies make them a good penetrator of the armor/shield layers like you say, not an out-and-out attempt to equal the force of the attack, but I'm dubious that the heavier attacks used by the Nanoha mages could be disrupted without a significant force.
Also, while I'd like to imagine that the BJ form a comprehensive defense like we've been discussing, it could be that 'reactor purge' refers only to the complete destruction of the jacket to form a last-ditch reactive defense, as when Nanoha was protected against Vita's final rocket-hammer strike only by the expenditure of the entire energy of her BJ.
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