Chances are, you’re going to feel weird for a day. You might think about that cat at random moments. That’s normal. You witnessed a small tragedy.
Here’s the silver lining: you gave a damn. In a world full of people scrolling past, you stopped. You did something. Even if it was just calling someone.
So grab a coffee, pet your own cat (if you have one), and give it some extra love. You deserve a little peace, and so does that cat. You did good.