What does Macduff want from Malcolm?

Macduff is being tested by Malcolm to gauge his loyalty. When Malcolm goes too far in what he might do as King, MacDuff says that Malcolm is not fit to live. Macduff also wants time to process the fact that his whole family has been murdered by Macbeth. Malcolm keeps interrupting Macduff to "dispute it like a man". Macduff just wants a few minutes to grieve.