Exactly, just like Battuta said. In fact when I turned to face that Karuna which just started to flank, normally at that timing the Orion fires a well placed shot wrecking it's rotating subsystem after which a more or less that then derelict Karuna is the first to fall victim to the Helios' dreadful beam cannon. In fact at about 3 minutes the Toutatis joins in flanking the Helios in this version of the mission, taking a beating while two escorting Karuna's try and suppress enemy turrets and the escorting Raynor. In one version of the mission a desperate cruiser even tries to crash into one of the GTVA capital ships to try and do some required damage.
When it is released it's probably done in bitesize chunks. Through cinematics probably the player is moved to several parts of the mission, not unlike a Battle of Endor, where at pointblank range several destroyers are faced until the UEF makes a daring bid to run the blockade through to try and disarm the Helios.
BUT! I'm starting to feel like I've totally hijacked Fury's post. *blush*. So feel free to PM me instead. If I do decide to release Helios, I might make a seperate thread for it.