This could be a bit of a stretch, but if a character planned on dying and being brought back, or just happened to die but there were allies nearby who both intended to and had the means to bring them back, then this is information that would be available to the tadpole. Thus, it would choose to sit tight.
Resurrection in the FR setting is a difficult contrivance to build a narrative around, though.
Can't you just open the skull of the dead, remove the tadpole and heal him / ressurect him after? I Mean, he is dead, so you can just open up his body now.
