[Sam meets that lethal stare with something firm and steadfast. Inside he might be concerned but he holds his ground and won't back down for anything. He wasn't the only one in all of this that was to blame and he certainly wasn't the only one in the dome that did things he shouldn't have but COULDN'T help.
Some of that tension leaks and he eases out of his stance with a nod.]
Good. [He'll top him off, letting the silence stretch. Course it gets him thinking...Thinking about how Buffy and Spike had history once and if he should be wondering if they did things they weren't supposed to too. It's a long shot though, right? They may not have even seen each other that day at all...
He's so tempted to say something, even starts to, but stops himself, thinking better of it. He doesn't want more tension between them.]