As a thought experiment, let's examine in extremely close detail a set of iterative changes that can be made to a single simple grammatical structure, turning it from a statement taken at face value into one loaded with unrealized implication. This makes for rich writing which rewards -- or even demands -- close scrutiny. [...]
The verb is still concrete, but it shouldn't be. In fact, the verb can be removed completely: convert it into a present participle adjective, and then use that participle as a modifier for a broad, general-purpose noun. In this example we'll use "incident" to at least acknowledge that the events took place along a common timeline, but even that much is still an unnecessary concession to specificity -- we could just as easily substitute "thing," which is so broad that unpacking it will command the reader's complete attention.
In addition, there is still a distinction between the subject and object which can be further erased. Both subject and object were "involved" in the proceedings, simply because both are present in the sentence. That new verb can apply to both nouns, making them equal and indistinguishable partners.