For the source text click/tap here: Pesachim 25
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Not only is it forbidden to eat hametz during Pesah, deriving other benefit from it is prohibited as well. In order to develop a deeper understanding of the relationship between eating and deriving benefit from forbidden foods, the Gemara compares hametz to other things forbidden by the Torah, including basar be-halav (meat and milk) and kilei ha-kerem (wheat grown in a vineyard).
One point the Gemara makes very clearly is that in a case of piku’ah nefesh – of danger to human life – we dispense with all of these rules.
Similar to the sugya in Sanhedrin 74, the logic of "whose blood is redder" is examined including the famous diyuk of Reb Chaim of Brisk