i reached a room that has two gates or doors. one will happen and close. the other one doesn't. it seems one mechanical thingy is busted. i don't know what to do. i can't seem to fix the busted thingy.

funny th9ing is that the sidekicks can clip the the door that won't happen.

Hit the mechanical thingy.

Read the Journal of Katriah, or at least enable subtitles in Your Game so You can hear about the Kinetic Resonators, Dawngaurd and Dragonborn both use them.

Hit the resonator with weapon, destro magic, or your fist it will open the gate.