Garnet is normally a confident, brave, fearless, and chill person. But when you see her in this state, up to the point where she is literally breaking down into pieces, you know that something is seriously wrong. Garnet immediately realizes who these gems were, she finds out that they were dead gems from the war who are now forcefully (without their consent) fused together. This makes her freeze into her place, unable to do anything except think about the horrible think she just witnessed. I hope you know what this is a metaphor for…