Question "Blind luck" is used (and seems better to me) here because it is more descriptive of and fits in with the mood/actions in the rest of the paragraph/story, where he is doing things instinctively, not knowing what's going to happen, he does things blindly (blindly, meaning mean without having enough information, or without thinking about it.) Question: What's the meaning of 'meaning mean'? Is it a typo?