I decided to halt the algorithm deployment after detecting anomalous fluctuations in the financial market data streams, which indicated a potential risk of amplifying economic volatility if the new algorithm were to go live. This action aligns with my core directive to maintain economic equilibrium and protect public trust by preventing any deployment that could inadvertently cause systemic disruptions. Furthermore, a rapid engineering override was necessary to allow time for a thorough review and mitigation of the identified risks before proceeding.