What I was trying to say was, it seems to still be the same curse that came out of Yoshie, acting independently, instead of under the control of a priestess (which would've been Mutsu). We haven't had explanation of what happens to each of the Leech Child curses, after they've killed their assigned targets.
It sure doesn’t seem to have any control.
The only thing resembling control we’ve been shown is, the mother raise the child in her body while telling the kid to kill their enemy. This set the target for the baby.
After that, it runs on auto-pilot based on pre-programmed course. They can’t do anything other than wait for it to finish its job.
I think in stories, curse typically go two pattern after finishing its purpose.
It either disperse (best outcome), stuck haunting a place (at least damage is localised), or start getting twisted and harm random people (then we have jujutsu kaisen situation).
Or like that saying, “when you curse someone, you dig two grave holes (for your enemy and yourself)”. The curse return to sender, and either the sender manage to defend themselves, or the curse kill them. Best outcome is if the universe consider that cleans the tab, restoring balance, and let the curse disappear.
That's usually how it is. After all, all the curses and vengeful spirits in stories and folklore are a result of human cruelty, whether directly or indirectly.
True...
Two popular curses in manga for example, are produced terribly.
Kodoku is made by putting poisonous insects in a pot and bury them under your enemy’s house. Stuck in the same small and dark space, they kill and eat each other until only one is left.
Inugami is made by burying the body of your own pet dog head down, letting it starve while there’s food placed in front of it, and then chop off its head when it suffered from hunger and being betrayed.
Honestly it’s amazing the person doing the curse doesn’t expect the curse will kill them first thing before doing whatever job given, after that treatment.