A chemical agent, delivered by a grenade or other means, that incapacitates a person by irritating the eyes.
Cassidy Casablancas was tear gas. His whole life was a smoke screen, leaving everyone in his wake in tears. He was seemingly harmless, until the pin was pulled out of him. His words pricked at their tear ducts, but the action of his smoke screen collapsing around him was what burned them. Cassidy was prominent for a few seconds, then he was disappearing. He swirled around everyone, affecting each one of them. They would squeeze their eyes shut, to try and stop the pain he caused, but no matter how many times they blinked it still hurt. Even though he had apparently disappeared. Cassidy Casablancas was tear gas, he left tears running down your face even after he was gone.