[He's perfectly willing to keep doing this for as long as necessary, or at least until the source of that drilling becomes apparent; the longer this goes on, however, and the more markings he finds, the quieter he gets. It isn't fear, exactly, so much as it is a deep sense that something isn't right with any of this; he'll spend a bit more time going over those markings as they find more of them, and eventually...
...Well, eventually a coherent idea of what's going on will start making itself apparent, and he can't say he likes it any. It isn't anything he's going to comment on, because he isn't quite sure how to comment on it, but it's clear he doesn't like it.]
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...Well, eventually a coherent idea of what's going on will start making itself apparent, and he can't say he likes it any. It isn't anything he's going to comment on, because he isn't quite sure how to comment on it, but it's clear he doesn't like it.]