When Kalgan is torturing Lea Jansen, he says that he wants her father's countermeasures. But when she is rescued and finds out MacPhearson is working for Kalgan, Capt. Devers is worried because MacPhearson knows all of the ship's countermeasures. If MacPhearson knows the countermeasures, then Kalgan does too, so there is no reason to bring it up while he is torturing Lea.