After examining him, rescuers determined that Harvey was unable to fly, likely due to some sort of minor head or body trauma, possibly from flying into something. He was also incredibly dehydrated and hungry, which is why Harvey had been so calm when he was rescued.
“Most people think that when a wild animal is acting tame, they think, ‘Oh it's sweet,’ or, ‘Oh it likes me,’ but that's not what's going on,” Compton said. “What’s going on is the animal is compromised. He wasn't able to fly so he wasn't able to hunt or eat, so that's why he was so calm. Now he's not calm.”