If I understand correctly, I must first kill all the enemies that appear there, and then interact with the button? Well thank you
no, you need to kill elite enemies in melee (you can recognize them they have HP-bar above their heads unlike regular grunts). This way you will get "aleph" which you need to be able to overload reactors ( 1 point of aleph for each reactor).
keep in mind, that you not necessary have to fight them in melee, but you need to make a final blow in melee, it will initiate finisher-animation and give you aleph afterwards (so you can put them in a "downed" state and easily finish them with Q-button attack (light strike), they still can shoot you back in this state though).
