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I think they spotted us, which is why they hid in the mine. If there are Inquisitors there, they definitely won't show themselves, especially considering they can smell Anders from a mile away. And "aggressive negotiations" with the count's son is, of course, a brilliant idea, especially when he hasn't attacked us yet, and we only "caught a glimpse" of him entering the mine. If we leave, what then? He'll disappear. And it will be his word against ours. At best, we can send Anders as a messenger. And that's without even considering the question you raised earlier – the existence of a second exit.