[This sounds like a terrible plan that's going to end with him in a heap on the other side of the park. But he's got to get the hang of this flying thing, so he grips the tree with both feet and hands and tightens his jaw.]
[It's just like anything else that needs skill and concentration. A change comes over Bert, his light grin fading into a grim look of determination. He tenses, eyes narrowing, waiting for the optimal moment...]
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[This sounds like a terrible plan that's going to end with him in a heap on the other side of the park. But he's got to get the hang of this flying thing, so he grips the tree with both feet and hands and tightens his jaw.]
[It's just like anything else that needs skill and concentration. A change comes over Bert, his light grin fading into a grim look of determination. He tenses, eyes narrowing, waiting for the optimal moment...]