"You're drunk," Sephiroth says, by way of explanation. As if that makes everything obvious. He waves Bert off when he comes over and the good-natured man thankfully appears to understand as he nods and walks away.

He did Wufei a favor so he really isn't sure why he's reacting this way. Still, to prevent any further access to alcohol he downs the rest of his own drink. Even for Sephiroth this might be a little bit much. Not that he realizes it.