A stand off
I'm happy to say it did end peacefully and Ramius walked down the stairs and past Finn with as much condescension as is possible in each and every molecule of his being (he's a cat - he's a professional). Finn did not chase him but ducked his head in acknowledgement of his own shortcomings and did his doggy best to apologize for not being born a cat. (He's Ok now, he's sprawled out on the floor with his legs in the air as only a dog can do.)
I on the other hand have been ruffling on Pattern 15. I will continue to ruffle.