From the article:
Scalia told a gathering at Amherst College on Tuesday night there was nothing improper about the trip and nothing about the case that made it a conflict for him.
"It did not involve a lawsuit against Dick Cheney as a private individual," Scalia said in response to a question from the audience of about 600 people. "This was a government issue. It's acceptable practice to socialize with executive branch officials when there are not personal claims against them. That's all I'm going to say for now. Quack, quack."