Cassidy struggled to seventh in the first of two FE races in Indonesia, failing to make much in-roads from 10th on the grid in his Jaguar-powered Envision car despite saving his final Attack Mode activation in the hope of a late charge.
With title rival Pascal Wehrlein winning the race after qualifying a strong third, Cassidy's lead in the championship has been slashed from 20 points to just two ahead of the final six races of the season.
