Arguably Toot took on and defeated Mavra an old Black Court Vampire one on one in Battle Ground.
It’s the team up which is intriguing Mister and Toot should be deadly enemies like Harry and Marcone, so it has to be a significant threat which affects both of them. Is Jim going to parody the ending of Battle Ground writ small?, if so is Marcone/Mister going to reveal he is a Malk Changeling and not a vanilla cat at all?
(If A Malk Changeling he would have an extra long tail, the loss is significant as Lea may have planted him as a spy on Harry as kitten, in PT/BG Harry relates a story of a kitten involving his father which is very like Harry and Mister. That would make Lea a very determined stalker. She is. Mister is old for a cat , 3 years old by Storm Front making him 18 by Christmas Eve, in PT we have Harry commenting upon Mister getting on in age, but not really any diminution, so maybe Harry is starting to suspect something?. As a Changeling he wouldn’t age normally and it would start being noticeable. Mister in his micro fiction refers to humans as Monkeys, a term the Fae use derogatorily about mankind when called fairies. When has Mister seen a Monkey?. His food bowl in the microfiction refers to him as Emperor which would make him a Cat Sith. Jim has joked about his cat Fenris coming into his house as a stray kitten under false pretences, he was just a very small stray cat about 2-3 years old and not a kitten who totally dominates all the other pets and humans.)
Technically Mister considers Harry his vassal (he is a cat) which means he could consider Toot the vassal of his vassal.
Mister probably doesn’t like pizza, but would accept any anchovies picked off of one.