This is only a guess ive never had that type of bird but, with our other babies that can mean they are weak and trying to use more energy and cant. A lot depends on how old he is, if he is young than I would start to be a lot more cautious and really watch him. if he is a few months old then it will be easier to get him back to health.
You can always kill/prepare the bird as a dinner entree for friends and family members. That'll teach the little thing to twitch and spread it's wings at you.