First, click the flag. Next, wait 3-4 seconds (say Mississippi in between each second) right after Scratch talks. Then, immediately after, click the bat. After all chat bubbles disappear, click the stop sign. (Scratch is the cat)
This idea was all mine! I was originally gonna have the bat pop up in front of Scratch, but I didn't know how to do that cuz this is my first scratch video. So, I just decided to have the bat behind Scratch. And I didn't have beginner's luck at first. I had to keep on trying, and I got it right after several tries. (P.S, I keep accidentally spelling "Scratch" like "Stratch)