Now let’s look at resistant suffixes. By “resistant,” we mean they don’t like to rendaku, even if the words before them would normally cause it. These suffixes are like oil to rendaku’s water!
Also, after 鼻血, there’s only one other word that has a rendaku’d 血
黄血 (brandling, when used as fishing bait) and I have no idea what that even means in English.
To me, resistance means what they say. It “doesn’t like” to rendaku. Even something that is “fire-resistant” will burn at a high enough temperature, it’s just rated to resist flammability up to a certain temperature or for a certain amount of time. If we want to dive deeper into the semantics of it.
“Block” (for prefixes) sounds a lot more absolute than “resist” in their explanation.
But as I said, there are only two words with rendaku’d 血.
There’s basically no rule that can’t be broken somewhere.