At other times, it groups together matters that are different, though not opposite, so that they give each other mutual emphasis, perhaps through contrast, sub-division, citing examples, deduction, complement or exception, etc.
It may make use of a feature of an event or a place, which is common to two purposes, in order to support grouping them together in the structure of the surah.
A person who is oblivious to these aspects may view the linking of the two purposes to be unnatural.
It, however, is not. It responds to the needs of the listener who feels the link between the two purposes.
If the two meanings or purposes have no natural link between them...
the Qur’an would then move from one to the other very gently, either easing its way through, or using the sort of syntax that allows compatibility between unfamiliar elements.
We may come across some subtle elements that we admire, but we would not be able to describe these if we were to be asked to pinpoint what gives them their excellence.
Indeed, we may find it difficult to determine where exactly the seamless joint occurs.