It might be a situation where whatever process is used to compress the energy into a cartridge, a similar specific process is necessary to get the magic "uncompressed" in explosive fashion. Not unlike nuclear weapons--you can't get a fission reaction just by beating on a warhead with a hammer. Indeed, the cartridge might not even contain "compressed mana" per se, but might be a one-use mechanism to channel mana from an external dimensional source. In that case damaging the cartridge wouldn't blow it up, it would just break it--like smashing a bomb's detonator when it isn't actually attached to any explosive material yet.
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