“What now?” said the dead mouse.
“You’re dead,” said Death. “Do what you like.”
“I’ll be a dragon!”
“Nice,” said the cat. “I am the knight.”
The mouse swelled up to a huge dragon. “You are dead!”
“I’ve died a few times,” the cat knight said. “Doesn’t mean I’m dead.”
The cat stormed through the house, turned, batted something only she could see, dodged invisible blows, jumped up on the chair, and struck.
“Aw, she’s playing,” her humans said. “Look at her go.”
Shortly, the dragon was defeated, and the cat knight went to reassure her humans.
“You are safe now,” she purred.
Then she went to have a nap, to be rested in case more ghost monsters attacked.
Initially just meant to be a single-tweet story, but I was asked if the cat was dead too, so apparently what was obvious to me needed to be spelled out. If a cat has died once, it can see the dead. Which explains what cats are doing when they are fighting something invisible.