In hamlet how do the first two lines indicate that something is amiss?

BERNARDO: Who's there?

FRANCISCO: Nay, answer me: stand, and unfold yourself.


Two soldiers who know each other have no trust. One asks who is coming? The other refuses and says Stand up and let me see who you are!

Something is definitely amiss when there's this much distrust!

=)

thanks you rock Writeacher !