As an irl doctor, that is one hell of an allusion... lol.
I cannot say it makes intuitive sense to me, but whatever gets people invested.
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Oh yeah not saying we do. It's just that the analogy had me tilting my head. An infusion of blood is the last thing I would associate with a barrier, since it is more of a reactive measure... But yes, as you said, not 1 to 1, so I'm not gonna nitpick any further.