Finding that Gradual Taylor, proceeding pro se, sufficiently alleged facts — arrest and prosecution without probable cause based on the purposeful and malicious filing of a false police report — that, when viewed in a light most favorable to him, make out a Fourth Amendment violation by Officer Hart and obviate her entitlement to qualified immunity (regardless of the fine contours of such a claim in this circuit at the time of the maliciously false report), we affirm the judgment of the district court and remand for further proceedings.