Superb photograph & a great narrative. My first thoughts were how well they blend in (like pictures 7 & eight) and the times that I had to look just a bit for the downed yote that I called in.
My second thoughts were that if the gent is not hunting those Coyotes, or if there is no hunters in the area, they need to be yelling at those yotes or even throwing rocks or such at them when close. The Coyote after all is an opportunist and will jump on the chance to get house pets, small children, or even adults if they become relaxed in an urban or rural area.
My final thoughts are that the yellow lab is in danger. It might have won this time but the Coyote is shrewd enough to stay just ahead of a dog for a distance but then the whole pack jumps in to teach that dog a lesson if not kill it.