"Don't do anything to put yourself in danger, but I think it unlikely that he will tip his hand that blatantly.  If someone tries to bring you over, they will start subtly, probing about your allegiances and desires.  In an absolute emergency, do what you need to to deflect suspicion.  Lie, pretend to join if you must until you can come back to the ship to report to me.  I won't let you be taken.  If you don't come back, I will come find you."