Got really lucky today. I was filming my friend light and release a Chinese lantern. The Inspire 1 was about 9 feet off the ground and 7 feet hovering in front of me. One minute fifty seconds into filming it flipped over landing on its top. At the same time the crash shot the battery out. Only damage was one broken prop. All the props remained on the craft but two of the prop locks were missing at first. Found them 4 feet from the craft. I feel very lucky that it happened close to the ground and in the grass. The crash is probably my fault. The prop locks are fairly new. 10 flights. The props were tight to the motors last flight. Could not tell you if they were this flight. Although I know all prop locks were securely in place. This I did check. I know how important a Pre-flight checklist is. Have always done one but the one time I did not check for prop tightness. This happens. Face Palm. Head shake. The prop probably broke when it hit the ground. Its hard to imagine it breaking in the air without any sort of impact. No chips and only very faint scratches on the tip of the broken front left prop. This could have been so much worse. So Thankful it turned out the way it did.