Time itself stopped in stage 4. All existence was unmade and remade. The cat who entered the yawn is not the same cat who emerged. This was done for the protection of reality from stage 3. Ask no further questions about stage 4 just be grateful.
The weird part is that I only got the first one because she's a PITA to take pics of, so I need to take multiple ones. (She usually stands up when she sees me with the phone, and ask for petting. It's awful photo material but damn cute IRL.)