A wand, drawn and ready, but he surmised it wasn't working by the way she growled at it in frustration. His wasn't working, and it was somewhat of a relief to know neither was hers. That might mean no one had magic, and no one could take advantage of each other.
"Er, I don't think so." Everyone knew how to spot a Weasley, so he wasn't surprised when she asked. What made his eyes as wide as tea saucers was when she introduced herself as Lily. Lily Potter.
"You– you must be joking," he said, taking a step back. "Lily Potter is dead. Has been dead. This isn't funny." The last statement was made with indignation as he recollected himself. He was a Ministry official, after all. It wouldn't do to go cowering in front of a feisty – and apparently delusional – woman.