In retrospect, it might have been a mistake to reverse the positions of Tabitha and Zoe in the bottom two panels. In panel four, Tabitha is talking in the background with Zoe in the foreground. In panel five, Tabitha is in the foreground, and Zoe in the background. ...maybe it's easy to follow though, considering Tabitha is the only one talking.
You can actually tell them apart by their wounds. Tabitha has the blood on her left cheek, and Zoe on her right.