The phrase "being ___ hand" is not a commonly used phrase, and it's difficult to determine the intended meaning without additional context.
If the missing word was "out of hand," it could mean that the boy was out of control or behaving inappropriately.
If the missing word was "on by hand," it doesn't make sense in this context as "on by" doesn't have a clear meaning.
If the missing word was "up to hand," it also doesn't make sense in this context as "up to" doesn't have a clear meaning.
If the missing word was "over at hand," it also doesn't make sense in this context as "over at" doesn't have a clear meaning.
Overall, without more information, it's difficult to determine the most appropriate option to complete the sentence.