"If it's weird we'll switch it off and find something else."

Mary shrugs. She sets a bit of a pace, because she's worried she'll miss the take-away delivery person. And then, because she's pretty nosy when she's not completely intimidated:

"So are you sure you don't want to tell me what happenened back there?"

Also if he's going to murder her and put bits of her down the sink she'd like some warning.