Kirk: (to the apparently motionless Lt. Sulu) Lieutenant Sulu (turning to Deela) This is nothing?
Deela: They cannot hear you, Captain. To their ears, you sound like an insect. That's your description, Captain. Accurate, if unflattering. Really there is nothing wrong with them.
Kirk: What have you done?
Deela: Changed you. So you are like me now. Your crew cannot see you or any of us because of the acceleration. We move in the wink of an eye. Oh, there is a scientific explanation for it, but all that really matters is that you can see me (moving closer to Kirk) and talk to me...and...we can go on from there.
Deela: Because I like you. Didn't you guess? Or are you so accustomed to being kissed by invisible women?