There is no Mimah Nafshach. It’s not that every spot is Assur. It’s that we don’t know where the Assur spot is, so we treat all spots as Assur. But at the end of the day it might be Muttar. So if you see the blood spot you have a Safek in Din about whether this blood spot is Muttar or Assur, something that we are Machmir on. But if you don’t see the spot until later then the Safek is in Metzius, was the blood in a Muttar spot or not? (I feel like you’re leaving something out. I haven’t done this in many years but don’t you need a second Safek in order to make this Muttar?)
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