do you even know where your pelvis is located? your spleen is in your mid torso. your pelves are located on both sides of your waist, you can feel them. he landed on his waist, not chest. he broke it, missed the rest of the snow season and spring baseball.
His reaction after doesn't really seem like a person with a broken bone, like he didn't yell or anything right away. But he should probably eat better if he broke a bone from that small(ish) crash.
you said this was his first urban, uuum as i read that i have this thought that he knows how to ride, but as i watch the video it looks like he has no idea how to ride hahahahaha
i dont think you could sit up like that without screaming if you had a broken pelvis...but i've heard of people who don't feel anything until they sat down afterwards