Let us not forget that the reasons for human actions are usually incalculably more complex and diverse than we tend to explain them later, and are seldom clearly manifest.
Find what gave you emotion; what the action was that gave you excitement. Then write it down making it clear so that the reader can see it too. Prose is architecture, not interior decoration, and the Baroque is over.
Our spontaneous action is always the best. You cannot, with your best deliberation and heed, come so close to any question as your spontaneous glance shall bring you.