The role of the Balance Guardians was a reglatory one; their magic influenced the regulation of the other magic in Nosgoth. We can identify three Balance Guardians, pictured above.
reg⋅u⋅late
   /ˈrɛgyəˌleɪt/ Show Spelled Pronunciation [reg-yuh-leyt]
–verb (used with object), -lat⋅ed, -lat⋅ing.
1. to control or direct by a rule, principle, method, etc.: to regulate household expenses.
2. to adjust to some standard or requirement, as amount, degree, etc.: to regulate the temperature.
3. to adjust so as to ensure accuracy of operation: to regulate a watch.
4. to put in good order: to regulate the digestion.
Balance. Regulate. To make sure that magic does not run ramped and not one person has to much or to little. I don't see where I could literally take it that he can completely shut off anothers' magic at will. Or suggest that he can make his own magical abilities limitless, which he does not, right?
So, ScreamPaste also pointed out it does say Nosgoth.
Nosgoth is now his universe? Not world....ok. But the 9 Pillars and all that is not legend of restriction in Hyrule's universe. Nor are the Goddesses being the creator of the world, law and life apart of the Legend of Kain lore.
So, now, it's clear that it isn't apart of his jurisdiction I think. None the less. Even if it was, I pointed out the Master Sword would still cancel out that ability if he COULD completely tap Link of all magical prowess. This isn't really the point you should be selling though.
I don't think Link can still deal with telekinesis of a 100% pure mental ability. Let alone this power to draw and suck out the blood flow form one's stream. (I'm still confused as why you continue to say it specifically is the blood cell, does it actually say that some where in the game? Because it's easier to just say the blood.) If you want to continue to say blood cell that is giving him a power I don't think he's stated to obtain. Even to go as far as to say it's minute Telekinetic control. There isn't any actual canon, word for word proof. It is speculation, even if it is evident.
It's clear he has an ability to manipulate blood, be it spell or the power over it in general. It has only been seen Kain is able to draw it out of the enemy. Slowly from the mouth, or violently in an eruptive combustion. I don't think that is enough to say he could palpitate it in ones heart to cause cardiac arrest or other internal injuries, since there is no canon proof of it. Even, once again, if you could see it evidently.
You gotta be fair and limit and restrict accordingly.
Still, pure TK is a problem at the moment.