I had a skull fracture & concussion as a pre-teen while skating. I was not OK mentally or balance-wise for months, and I wasn't trying to get back on the ice.
I have a bunch of students who have earned concussions during sports, and their recoveries are usually not swift either. Our state has a concussion protocol, and our district has a concussion protocol for academic work, too. Some kids bounce back relatively quickly, but many don't. Lights, sounds, mental focus, visual issues...all really common. Athletes desperately want to get back to their sport, and it is often not to the benefit of their longer term health.
I am so sorry for Deanna and Max.