Ah Mr Sheldon...I've been waiting to meet you

This cat, which is almost as big as Sheldon, has just been the subject of 20 mins of incessant barking by Sheldon. He saw her (I'm assuming it's female but it may not be) ran outside like a puppy possessed, chased after her then must have been swiped or something as I heard a yelp from him and then he ran behind my legs. He's been barking for the past 20 minutes and has now been deposited inside by me as I think he'll be annoying the neighbours (and me).

He's all bark and no bite. Round 1 to her!!