Kitty could technically follow him into invisibility because knowing how to do full-sensory invisibility is like the one unifying feature of all SR mages, but she is being a perfectly regular kitten here.

Right?

Very unsuspecting, much normal.

So she lets her first reaction, which is to dig her tiny claws in and hiss when the cat she stands on suddenly vanishes, be her last reaction to this, too.

There was nothing to watch.