When Jung must hack the computer to open the door to Irena, enemies rappel
down from the windows. Before you tell him to hack, send your team to the 
far side of the room over near the fenced area. Then, run behind the 
computer and tell Jung to hack it. A trigger will activate and the enemies
will start pouring into the room. Your team will take most of them out on 
the way to the computer. If someone on the team goes down, Jung will stop 
moving towards the computer and sit there (or Michael, depending on who 
goes down). Once there is a pause in the battle, tell him to heal your 
partner. You can then order them around as usual. During this time, Jung
was supposed to be hacking the terminal, but killing all the enemies skips
this part. Once done, tell Jung to hack it again. He will open the door to
Irena. Michael will get left behind. Watch yourself; there are enemies on 
the stairs above you and will pick you off as you come up, especially on 
on the Realistic difficulty setting.