Ryan nailed it. A second stroke to clear the screen.
Agreed, the right way to do it is to set it up so you are single stroking everything. Double stroking is usually more of a bandaid for something that isn't set up correctly (mesh count, pressure, angle, etc). But sometimes you do end up double stroking. I'm pretty sure that in most cases, you probably don't really need to double stroke, but just throw the extra dry stroke after to clear the screen without putting down more ink. Just thinking aloud.