12.4-5 and -6 are basically combining 12.4-4 and the load combos in 12.4.2.3. They're just explaining there that when you use 1.2D, you should add Ev, and when you use 0.9D you should subtract Ev. The idea is that you are "worsening" the effects of DL with the vertical EQ load. So if DL is...