It sounds like he's at the beginning of the Doomgiver. After killing several waves of Stormies, you walk around and come into this room that has the droid-size doors with Force fields, one people door straight ahead (locked), and two people doors on either side (open, but the ones behind them are locked).
If this is where you are, then hint #1 is to examine the ceiling. You're looking for a grate that you can cut through. Hint #2 is to look inside the two open doors.
Duct Tape is like the Force: it has Light Side and a Dark Side and it binds the galaxy together.