I guess that I should correct myself a little. The chart is vote share vs votes reported, not vote share vs. time, so “instant” is not quite the correct word. There could be any amount of time between the Trump jump and counterbalance, and being late in the count actually makes it less likely that there would be anything in between (but not that much less likely, as is evinced by the long segments of flat lines in the last quarter of the count)