We saw Peridot accepting Garnets offer to fuse while not being really convinced. And so Garnet starts the fusion dance.
There they are. She has a good hold on Peridot. But what does she when the green gem suddently changes her mind? What does the crew chose to put on first plane when that happened??
She releases her hold right away and tells Peridot that it’s just fine. They show that when someone changes ther mind and says “no” then it’s “no”. No questions asked, because fusion is a choice both partners must make.