Recently, I witnessed a pedestrian-vehicle collision. As I approached, nobody was rendering aid, so I took it upon myself to do so. The man wasn't breathing, so I applied basic first aid by tilting his chin to clear his airway (following A-B-C, deciding breathing was more important that possible neck injury). When I did so, he immediately coughed up massive red "globules" or "chunks," along with tremendous amounts of blood. Then, he began labored breathing.
Until EMS arrive, he continued to dribble blood, while occasionally thrashing and then coughing another "big globule" or "chunk," red and covered with blood, and slightly slimy looking. I didn't touch these so I have no idea their consistency beyond appearance. These chunks were about golf-ball sized, and roughly spherical.
I don't have much information on his injuries as I don't have much training. He did have a big dent in his head but he had a pulse and was breathing, so I'm assuming the chunks weren't, like, his brains or something. What might I have been looking at?