Lane Swapping

As a bot laner, when either the enemy tower or my own tower falls, in what situations do I rotate top, and in what situations do I not rotate top; in the situations where I do not rotate top, what do I play around on the map, assuming me and the enemy ADC/support are roughly equal and I do not need to afk farm to catch up?

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I usually default to rotating, but when the top tower has literally 1 plate left and it will be taken in a few autos either way, I don't see a point in running top. Loosely related subtopic, when my solo laners feed and allow their laners to snowball (an issue I've especially been having with Pantheon) what can I do? It genuinely feels like once a Pantheon is ahead by a significant margin, holding until he falls off is impossible.