Swing accident

I was just pushing Landen and Dade on the swings at the playground outside our apartments. Landen kept sliding forward on the swing and then as the swing was going forward he just let go. He fell backward off the swing and landed on his head. It scared me so bad. I ran up to Landen and he was just lying there looking around like he didn't know what had just happened. He started to move so I told him to just lie there and I asked him if he was okay. He said he was okay. I asked him again if he was hurt and he said that he was okay. So I had him get up. I was so surprised he didn't cry because it looked like it had hurt. I think he was just shocked at what happened and still not sure of what happened. He looked at me and said "fall off" then he said he wanted to swing again. I got him on the swing and told him to hold on and not to let go. He said "okay hold on, be careful". What a trooper. He fell off the swing and just got right back on like nothing happened.