He knew he was gonna lose, and dropped out..hate such people..to all you cheaters out there, please play fair and square..
If he keeps up at it, he'll be known by everyone soon enough. That's what those smiley faces to the right of names are for. Ones with Halos are people who have never dropped from a match (or do so, so rarely that it's by accident when it happens). Green means they rarely drop from matches (you can usually assume this means it's by accident, but they have bad connections occasionally).
Orange means it happens more frequently, and can be assumed that they're doing it on purpose. Red means they're doing it frequently and are most assuredly doing it on purpose or have the worst internet connection known to mankind, either way you don't want to play them.