Stay tuned for next season......"
OMG! I'm going to rewatch right now....
You're right. That blade was covered in blood when Pete swung it back, before he struck Reg with it. We know that Michonne always cleans it off, and that it was indeed clean when she hung it over the mantel.
In the last scene, Michonne's brow began to wrinkle as something seemed to be occurring to her. And why was Carl not right there, wanting to know who broke into the house?
Mmmmmmmm
Where was Michonne when she put her sword back on? I took it that she was back in the house because she had to get scabbard for it? So, if something had happened to Carl and Judith, wouldn’t she have already discovered it?