But can you command them to kill?

[Pete Ross Junior]

Scientists Confirm You Can Communicate With Your Cat by Blinking Very Slowly
Science Alert

...

In a study published in 2020, scientists observed cat-human interactions, and were able to confirm that this act of blinking slowly makes cats – both familiar and unfamiliar animals – approach and be receptive to humans. ...

Only if they already want to.

[Ocelot II]

1. If you have a cat you already knew that.

I exchange slow blinks with the feral cat who lives on my porch as well as with my pampered old indoor cat.

[SheltieLover]

2. Same here.

Ferals seem more willing to blink back.

[2naSalit]

4. I do that with the cats in shelters when I go to them.

I actually learned it from deer.

[Bayard]

3. Never thought about it

Will have to try.

[2naSalit]

5. Someone finally did a study!

I have been doing that with many species for years. It works with most wildlife and certainly with domestic pets.

[I_UndergroundPanther]

6. I slow blink Othello

And say I love you at the same time so he associates the words with the good feeling slow blinking with cats feel when they get blinked.