They can also stop laying because they are molting or something has stressed them. Stress can be anything from predators lurking (real or imaginary), enclosure being moved, new quail neighbors, change in food etc.
I can vouch for that! Looks like there was a fight but it's just molting - next you may see greasy looking spikes, freaked me out when I was petting a quail and thought it had a bunch of tiny hard bumps under its feathers on the skin, was just growing feather shafts