AT&T Hourly chart
Returned normal price after 2.5 hours of trading at 7900+!
Action: Called the broker to help manually close all the ATandT short positions at around 18.82 to avoid a major crisis in my trading career, while the prices were still trading at 7900+, prices supplied by the liquidity provider.
Atermath: Suddenly lost confidence in shorting though being profitable from shorting in the past years. Closed all US positions pending review of trading strategy for the future.