Severus listened to Regulus's admission, took note of the other man's attitude while explaining, and wonder if he sounded just as cavalier over his own traitorous activities. The other man didn't elaborate, and Severus wasn't so interested in finding out - probably, the less he knew the better. He nodded when the other man finished, and did not push the issue.
He finished off his drink and placed the empty glass on the counter.
Severus surveyed the bottles, taking in the labels. Regulus might not have any idea what any of these liquors were like, being muggle made, but they were very familiar to Severus. Most of the specific brands were American, and so he couldn't exactly say he knew them intimately - but some of those labels were mainstays in the Snape household - they frequented the cupboards more often than actual food did.
"I predict you wont last beyond the seventh type we try," Severus taunted, if it was a matter of a drinking contest, he was sure he had this in the bag.