Had a repeat episode yesterday morning. I was getting around to go to a family reunion, and while getting in the closet in my upstairs hallway, Smokey started nosing in like he likes to do. I was needing to close the closet door, but he was refusing to move and wanted to nose in further. So, I did what I've done hundreds of times since he was a kitten and picked him up so that I could close the door. Casey was there in the hallway too, and when I put Smokey down, he started in with hissing and growling at Casey. By the time I went to leave, he'd calmed down enough that I felt safe leaving them alone. By the time I got home late in the day, things were back to normal.