Doc can't resist adding a tinge of melodrama to everything. And while he wishes he could remember clearly exactly what it was that they had seen in the museum, he also knows that ultimately it is another part of the mystery of the town, and recalling all the details won't help them in their efforts to leave.

"No that was just. Carelessness. Would have probably traded blows with Negan though if we had to spend the night together. He's got quite a mouth on him." ...not that kind of blow, Raylan. Or mouth for that matter. He just gets on Doc's nerves and Doc is certain that he does so deliberately.