Thank you for your comments. He is 15, I think. It could have been heat exhaustion. I highly doubt that he would claim anything on our homeowner's insurance. He has been coming on and off for two years and is one of the nicer ones I have had the pleasure of knowing, so no I don't plan on calling child protective services. It's unfortunately something that happens in this weather. I am so proud of my family and many neighbors who ran over to help. We had cold bottles of water for anyone who needed it, bags of ice for his neck, and a towel for his bleeding head, not to mention we took turns holding him in a comfortable position. With any luck the father and son were able to see the genuine kindness of "worldly" people. The father rode in the ambulance with him, so I am certain that FS was over for today. As for the rest of the JW's who came by, I don't know.
Update: the father called me tonight to fill me in. Many tests were run, and they all came back negative, so no lasting or underlying problems. He took a very long nap today and seems to be recovering well. He doesn't remember the fall or hitting his head, I am glad to say. I am most enthusiastic that the father let me pray for them over the phone and was very receptive to the idea. Remember, I am not a JW, so that was a big deal in my opinion. They will not return next week as it is their convention. Hopefully the following week, I will hear that he is happy and healthy. Thanks for your comments. For those who have been through it, I'm sorry. It is pretty scary.