פירוש על קידושין 118:12

R. Nahman holds that even after the husband nullifies the agency, the husband can still use the get. This seems to mean that speech does not nullify speech for the get is still valid. So how can we hold like R. Nahman and like R. Yohanan.

The resolution is that the husband was nullifying the agency, not nullifying the get. He can still use the get should he later on decide he wants to divorce his wife.