On my one mile of dirt road there were three teenagers, one of whom'd had a nasty MTB wreck on the adjacent trail. Moms had already been called. The injured kid got on his bike side saddle and his friend held it up and pushed it. I walked with them to the trail head about 1/2 mile away. He was banged up but not bleeding or in shock, and anyhow my boy scout first aid badge hasn't been used in nearly 30 years. I felt a little foolish and helpless to render aid. I talked to them about the trail, which I ride sometimes too, and he told me the feature he crashed is called the "Toilet Bowl" which was news to me; I told them they were all doing great, told him not to worry and he was on an adventure with his friends; gave him some ibuprofen and went on with my ride home. I hope I at least reassured them.