Asuran (Reunion) was captured by the Wraith in an attempt to shut down the attack code.
The Wraith contained him in a forcefield and forced Dr. Rodney McKay to reprogram him so he wont attack the wraith. However McKay failed and he woke up and broke out of the prison at the same time Lt. Colonel John Sheppard and Teyla Emmagan arrived to retrieve McKay. They shot at him with lots of fire power which had no effect, however he doesn't attack them but attacks and begins killing all the Wraith in the Wraith weapons research facility. (SGA: "Reunion")