As Rune hasn't felt very much threatened or endangered by much in his life, the prospect of very real danger presented by Mr. Helpful's interpretations of the forts and Mr. Evil has presented him with a terrifying prospect. Exploring forts and dangerous places are not in his line of work, or in his expectations of searching for his brother. So this would prompt him to be concerned about his actual safety for the first time in his life, and thus say such to Walter.
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As Rune hasn't felt very much threatened or endangered by much in his life, the prospect of very real danger presented by Mr. Helpful's interpretations of the forts and Mr. Evil has presented him with a terrifying prospect. Exploring forts and dangerous places are not in his line of work, or in his expectations of searching for his brother. So this would prompt him to be concerned about his actual safety for the first time in his life, and thus say such to Walter.