Claim: Queenie didn't push Arthur down the stairs.
Evidence: Queenie was cooking dinner for Arthur when he fell. A close examination of the scene shows that there was food on the stove, indicating she was engaged in preparing a meal. Since she was physically occupied in the kitchen, it is impossible for her to have been on the stairs to push him.
Logical Thinking: A person cannot occupy two places at once. Since Queenie was in the kitchen, it is clear she could not have been involved in Arthur's fall down the stairs. The evidence points to her innocence in this incident.