http://youtu.be/zIGcoFeLIjo
Putting someone in a headlock is a fairly instinctual thing to do in a fight. Travel to any schoolyard playground and if there is a bully there who likes to beat up on the other kids, odds are pretty good that the bully will employ a headlock.
It works. There is nothing inherently foolish about using a headlock. When the bully starts punching his victim in the head with his free hand, it can become especially effective. There are smart ways to get out of the headlock. Watch the video above to see a couple of those smart ways.
It is important, I think, as a system that focuses on self defense, for us to know some basic ways to break a headlock. I also think it is important that we learn some smarter ways (besides the headlock) to pin someone (Kesa Getami is the one we mention in the video).