as a human woman, which represents a greater imminent threat?

No. This is NOT the takeaway. The bear is clearly the statistically-imminent threat (let's say a brown bear to ensure it's hostile and deadly). The point is that you know exactly what the bear will try to do: kill you. You don't have to greet it, you don't have to worry about it's intentions, you don't have to worry that your social interaction may push the bear over the edge, you don't have to worry about hurting it's feelings and risk making it a threat, you don't have to worry about sending mixed signals, you don't have to worry about your clothing choice, and you certainly, certainly don't have to worry about it raping you without witnesses. It simply is a violent threat. You use bear spray and hope you can run far enough, fast enough. You don't get to make that immediate reaction to a man, between compassion for the innocent, societal pressure to not ostracize men, and legal repercussions if you get it wrong.

It's not really a thought experiment, though. It's a hyperbole, a funny way to say women are afraid of the toxic masculinity types.

Are there non human women?