"Nate saved our son's life; he's our angel," Hanna said, "I feel so blessed to be in his presence. He saved my baby boy."
Fortese has been in and out of consciousness, his father said. He will likely need long-term physical therapy, although the extent of his injuries isn't clear.
"He does recognize people," Jim Fortese said. "He knows our names at times. But then he'll start talking in tangents. He will just go off and start talking about different things. He'll say, 'Where are you taking me. Are we going fishing?' "
Other incidents of violence at pro baseball games around the country have drawn national attention, including a fight between Dodgers and Giants fans at a game earlier this month in San Francisco. And in 2011, a San Francisco man suffered traumatic brain injury after being beaten outside Dodger Stadium.
An Orioles spokeswoman said the team was aware of the incident but had no comment.
Hanna said her son doesn't seem to remember what happened.
Queen said Fortese climbed up to the section where Fleischman and Bell were sitting. Police said Bell had been throwing beer on fans; Queen said her back and hair were soaked.
"I can't remember what I even said when it all happened," Queen said. "I just remember seeing him bleeding on the ground, and screaming and crying, 'Is he OK. Is he OK?' "
Queen and Fortese met on May 18 at a Luke Bryan concert in Virginia.
From the hospital Friday, Hanna said she was grateful but still trying to understand how an evening at a ballgame could go so wrong.
"It's absolutely ridiculous to think that my son is just going to Americans' favorite pastime, a ballgame, and this is what happened," Hanna said. "You think your family is safe out in a public area.
"It's just appalling. It's totally unacceptable. A lot of things need to be answered. My son's life was certainly at risk, and he still has a long recovery."
Baltimore Sun reporter Jessica Anderson contributed to this article.