Dasein is inundated by the resonances of being. Self-understanding as well as the moods of being to which Dasein is open can be shared with other Dasein in speaking with them. Talking to each other does not necessarily have anything to do with encounter in the specific sense employed here. There are many modes of talking to each other, ranging through the reporting of information, providing facts, instructing and teaching, making a business proposition, refusing a request, exhorting to a political or moral stance, calling for critical consideration of a state of affairs, discussing a problem, working out a common way forward, proposing marriage, etc. etc. For the most part, talking to each other is a matter of discussing daily concerns arising from the involvement with things, from inter-ests, whether it be at the personal level or the political, social or economic levels.
Encounter is already an exception that enables a special kind of talking to each other.
Talking to each other is usually directed towards taking care of things in a daily life which has already assumed a firm, habitual cast. The exceptional nature, i.e. the ontic rarity, of an encounter that may possibly lead to a recasting of self should not be allowed to obscure its fundamental significance in an ontology of existence, for it shows how Dasein's self-casting is essentially open to the malleability inherent in Mitsein. As essentially Mitsein, Dasein cannot help but listen to others and thus explicitly share the world in speech.