Well, "from memory" isn't exactly a strong argument when said "from memory" is a crucial part of it. For all we know, the bear could be attacking the locals. Or got infected with something and needs to be put down.
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You don't think them turning a glowing purple for twelve seconds every minute would be sufficient differentiation?
You don't know what. For all we know, less than that was deemed "sufficient" but Blizzard decided to go one step further. Or more.A permanent skin color difference along with tentacles and a permanent void thematic was deemed a sufficient distinction.