When Detective May found one of their masks, Harry was convinced they would end up arrested. But, in a strange switch of roles, it was Hermione who came up with a solution on the spot. She silently withdrew her wand, and Harry immediately caught on. When they turned around, the couple stunned both detectives. Afterwards, they hid the mask away. Hermione quickly erased their minds, making them forget about the evidence, before waking them up.