Conveniently (...or not), it's Galadriel that's got Severus the most potentially unnerved. What intimidates him about elves is what intimidates him about Dumbledore - just on some serious magical steroids. The perceived ability to see right through him. And what is there to see? Not even Severus is completely sure, some days.

But he stops. He knows who she is and she knows who he is, so he doesn't bother deflecting her opener about intrigue with an attempt at introductions. Or anything else. Severus watches her from near the door, quiet, and waits for some indication about what he should say. Why? is implicit in the absence of other words.