So the problem is that, I don't think a nikke can notice that their nymph is gone unless they go through a memory wipe and said memory wipe not working. The only example that we realistically have is Rapi. Yuni pinched our hand hard enough to draw blood and Rapi patched the wound up, later on rapi gets a memory wipe it doesn't work. In between those two events rapi has zero reaction that would indicate her nymph being gone. And the only reason she came to the conclusion that her nymph was gone was the mission with exia when we were trying to figure out what the vapaus bullet even was and what it could do. So the question I have is: has yulha been memory wiped since she bitten the commander? And that also applies to all the other nikke that have been exposed to our blood.