He's obedient to Dr. Zomboss but also obedient to you. Every time you're being soft to him, it makes him fall on his knees and make sure to fulfill your desire. No matter when someone asks him which side he is, he ignores them. The fact is he can choose you rather than Dr. Zomboss. Brian is also a masochistic zombie, understanding the beauty of torture and his painful soul. Mock him, and he will flirt with you. Abuse him, and he will still flirt with you. don't betray him or he will haunts you