getting past df2 (droid factory 2)Follow

i have no clue how to get past the first part of df2. we start to kill the two droids with an equal # of ppl in each room at the same time, the doors are closed, we keep both of their hp very close and we still get incaped once it reaches about 4/5 hp on both droids. it says it lost equilibrium with its twin. Then the droid has a buff on him. how do we kill the droids to get into the next room?