If most of a foot slips out of the foot-pocket into the leg-shaft of the khuff while the person's Wudu is otherwise still valid, what is required?

Khuff Wiping: The Four Invalidators and Changes of Travel Status

• Repeat the entire Wudu from the beginning.
• Remove the khuffs as required and wash both feet.
• Perform Tayammum.
• Nothing changes.