He's mostly unimpressed because it didn't affect him as much as he thought it would. Unfortunately, it's also a reminder that, perhaps, they truly are far removed from Middle-Earth, and Arda itself. Legolas is not sure if he likes that or not.

The first thing he does is hand over the carafe, because he can see his father eyeing it. He's already tried it and found it to be real wine, though a sip was all he'd taken. The question, though, confuses him.

"I.. I fear I do not know. I have not seen Mirkwood in several months.. T'was an errand and a journey that took me from our home, and I have had little chance to send word back. If- if you have gone missing from there, I would not have known. Neither bird nor beast have brought me ill-tidings from the woods." A loss of memory? Doubtful; they are Elves. But what else could it mean? "Do you not recall my departure from Mirkwood?"

Definitely not one of the better ways to kick off a reunion. He hopes the wine helps.