I have a similar story, fighting and chasing with my brother. In our case, I got to the back door first. As I tried to shut it and lock it on him, he tried to stop me and put his leg right through the pane of glass. Deep gash, lots of blood. I don't remember what we did about it, as it would have been hours til our parents got home. Probably rang Grandma and Granddad who lived just down the road. I think he still has the scar.