Are these sentences all worded properly?

That night, Anton, Dalabrac, and two Fire Knife agents infiltrated the temple of Amaunator to seize Stedd, and Umara entered the building at the same time. Umara found Stedd first and freed him, but they were then attacked by a group of silvery female angelic creatures who had been summoned by the temple’s priests to prevent the pair’s escape. Anton and his comrades quickly joined the fight in order to aid Umara, and together they defeated the silver women, though one of the Fire Knives was slain.