I am sorry, but the provided information is insufficient to create a case summary. The title "Section 21(1) in The Terrorist Affected Areas (Special Courts) Act, 1984" and the court "Union of India - Subsection" along with the date "31 August 1984" do not represent a complete case citation. A case summary requires information about the parties involved (Petitioner and Respondent), a summary of the facts, the issues raised, arguments presented by both sides, the Court's reasoning, and the final conclusion. Without this information, I cannot provide an accurate and helpful case summary. To create a helpful response, please provide the full case citation and a summary of the case details.