Adversative

In Matthew's Q-source, this short sentence may have been introduced by the strong adversative conjunction, "but" (alla).

In an adversative causative, the "causer" has only a nominal status and is, in actuality, a victim of the situation ...

This type of 'get-passive' typically bears adversative connotation, i.e. it is not used to express passives if the patient is not somewhat negatively affected by the event.

The adversative passive sentence expresses that the subject of the sentence is affected, usually adversely, by what is expressed in the rest of the sentence.