My 12yo had a crash yesterday evening - he landed on his head at speed following a downhill jump when a branch got caught in his wheel. Cue ambulance, body board and the rest. Thanks to @Richard A Thackeray who was on hospital duty at the time. We'll have to meet up properly Richard rather than me being a concerned parent when we spoke. The helmet's smashed and the newly-built cross bike looks a mess but he's ended up with just cuts and bruises.