I was just thinking, do nid weapons ever go haywire? Lesser creatures revert to their "instinctive behaviour" in the absence of a synapse creature, so it should be the same for a weapon. If a fleshborer was damaged, for example, and stopped secreting hormones to keep the ammo quiet, then would the beetles all burrow their way out and start eating their host? Since most weapons seem to be bioengineered from pre-existing life forms, this seems quite possible.