Oh Nic, big hugs - what a terrible thing to happen! It's amazing the people out there who will watch kid or dog keep running, no matter that a parent/owner is chasing after them! I held onto a dog (I know, not a precious child, don't mean to equate the two, just illustrating people's inability to help out) in Hyde Park for a lady I could hear calling after the dog and it just kept running from her. She came over and was so grateful, I told her that my dog is a runner too - can't people just put themselves in your position?? Hugs to you, hope your heart rate has come down