Leashes only function if one end is connected to the dog’s collar and a person is holding the other end. Over the weekend, I saw a dog running free (and fast!) trailing the leash with two people running after him. In an attempt to pass the leash, the first person had let go before the second person got a good grip on it, and the dog capitalized on this mistake. I helped them collect their dog before he had the chance to run into the busy road, but it was a scary time.
When handing a leash off to someone else, be sure that the other person has hold of it before letting go. I suggest that everyone do this, and I certainly teach my children to do it. Here’s a video (taken on Halloween—hence the poison dart frog attire) of my kids safely transferring the leash. My son holds onto the leash until he has asked his brother if he’s got the leash and received an affirmative reply. Only then does he let go.