system
Given the following post, respond as if you're commenting on Reddit:
human
Could Magneto feasibly control or kill someone using the iron in their blood? (READ INFO TEXT)

I am almost certain that normally he wouldn't be able to, but if his control over metal was somehow amplified or directed at the iron in the blood, could he? And is there any existing tech or magic to do this?
gpt
Actually, he used to be able to do it with absolutely zero enhancement. He once took over an entire military facility this way and has pulled all of the iron out of someone's blood to fashion it into a nail to kill them with.

Of course, nowadays he's not quite as in control as he used to be, but he'll undoubtedly reach his previous heights some day soon.

Magic and tech might be able to do it, especially magic, but why bother when you can hypnotize them or hijack their brains to fulfill the same purpose?