Removes a disguise from

• Exposes, as a villain's secret identity
• Exposes, in a way
• Foils, perhaps, as a villain
• Reveals by removing a disguise from
• Reveals the identity of
• Reveals as a fraud, say
• Reveals peacekeepers beginning to make requests

Wiktionary Word definitions in Wiktionary
vb. (en-third-person singular of: unmask )