“Disrupt Arc energy and shut down the power flow.”
Head down the hallway in front of you. This will lead to a split corridor. You will find a number of Fallen scattered in it.
Claer out what Fallen you can. After that, some of the Fireteam needs to head down the corridor. Time your movements carefully. There are regular Arc Bolts coursing the length of the hallway. They do heavy damage to anything in their way. Be wary of the safe spots on either side of the hallway. Exploder Shanks can get you without much warning.
Whoever carries the Orb from the end of the hallway to its slot must be very careful. They are slowed because of the orb. Advance one safe area at a time. Bring it to the far end of the corridor and place the orb to stop the flow of Arc energy and open up the next part of the strike.