"so i'm holding onto the details capture this moment in a series of carefully chosen words and phrases and then replay it" This is an interesting sorta meta realization and description of songwriting, the literal feeling of capturing a feeling.. or a memory ..or a memory being made there and then.
i basically poured my heart out in the previous couple of lines, and i understood that i'd probably completely submerged myself beyond any chance of getting myself back out in any 'normal'ish way, so, ....... i sort of figured i might as well become an alien at this point...... froze the harmony on a sort of ambiguosly not-really-stable but not-really-unstable, semi-awkward place, and then rigidly went to prose to literally explain what a diligent artist surely often tries to do, in situations where they encounter an inspiring situation or moment. simply try to capture it, like a scientist would capture some kind of specimen