Why do men eyes turn black when they rape you?

Today I was doing some homework at a park and there wasn’t anyone there and I was so focused in my homework and then I heard a little noise and saw a guy his eyes were black almost like dead like they don’t look at you as a person but more like a prey, it’s scary. It reminded me when I was nearly 🍇 the guy was on top of me and I was begging him to stop and his eyes were black and dead. Thinking about it right now makes my chest burns.
Why do men eyes turn black when they rape you?
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