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I bet if you got down on your hands and knees, magifying glass in hand, and looked into the grass after that Listerine spray, you would find out why it was so effective. That Listerine is alcohol-based, and you just gave them skeeters one heck of a buzz -- can't even get airborne! It's party time at the Grassy Clump Hotel for them!!
I'll be sitting in the middle of a country field that has loads of skeeters every year we go there to watch the fireworks display put on by a potato chip maker in that area. I'm taking a spray bottle filled with Listerine with me, and I will report back on what happened.