Bike crashes

Last night we were on our way home from our neighbor's house. Jac and Laney were in the truck, I was walking, and Kelli and Makayla were both riding their bikes on the sidewalk next to me. I was right next to Kelli because she just got a new bike with training wheels so she is still trying to get used to it. It was night time and getting dark, but you could still see pretty well. Anyway, Makayla comes riding back toward us really fast and I looked up and told her she better slow down so she wouldn't get hurt. Right then Kelli came to a driveway that kind of sloped down in off the sidewalk. Not really bad, but enough that Kelli hit it just right and her bike tipped over. I bent down to look at her scraped knees and I hear a thump followed by Makayla crying. Apparently she didn't see the mailbox in front of her until it was too late to stop. She got a bruise on her chin and two long scrapes just above her chest, about 7 inches long. Not deep at all, and they really weren't bleeding much, but enough that you could really see it. Seriously, they both happened within 10 seconds of each other. Nice. Next time we'll just ride in the truck.