In “Zaydun ghāʾibun. Sāfara ams,” the second sentence can answer a question prompted by the first: “Why is he absent?” This explains a form of separation in which the following statement clarifies the preceding one, often described under shibh kamāl al-ittiṣāl.
If the statements are merely two independent reports at the same level, coordination may instead be appropriate. Punctuation alone cannot prove the rhetorical category; there must be a reason to hear an implicit question and answer.