Just look at exactly how many shots the Kings have attempted in total in comparison to Phoenix. Eleven Kings shot attempts were blocked by the Coyotes in the first 20 minutes, and L.A. missed another four attempts. That's 32 total attempts at the Coyotes goal --- in 20 minutes of hockey. Dustin Brown led the way (as you already know) with three shots on goal, two attempts blocked and one missed shot.
In addition to those four shots on goal Phoenix took, they had four missed shots and one shot blocked by the Kings. Use your math and you'll see that the total shot differential in the first period was 32 to nine, or plus-23 in favor of Los Angeles.
The score might be tied thanks to a downright silly Derek Morris goal from center ice, but Phoenix has zero chance in this game if they can't find an answer in the second and third periods.