LOL you got lucky this time. Believe me.... someday he'll figure out hot to tangle himself and then you'll be in for it.
I'm lucky with mine, he knows how to UN-tangle himself if it's not too bad and he gets some encouragement, and he usually stays more or less on the trail so long as it's not too narrow. It's when we get into briar patches we have the problem. He likes to get the leash tangled in them and uproot them by the handful, and then I have branches with thorns as long as the first joint of my thumb to untangle from my lead.