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I have to ruin the joke but this is not really accurate.

Cat’s are not thinking about “killing” when they have this look. It’s the “play & snack mode” a very positive feeling for the cat. They don’t have the idea that they might hurt or kill another living being in the process.

The real “kill mode” is when having a dispute with other cats (or cat like animals) that they identity not as a snack but as a cat like thing. And this look is much closer to the left picture.

It’s not “kill mode”, it’s attentive.

Learned that in elementary school

The cat will open its pupils when gunting, since closed eyes hinder its sight