The video at T1.5 is paused, and the video at T2.5 is playing. Those are banal, ordinary facts; the difference between them shouldn't surprise us, any more than the fact that length of the string "hello" is 5 but the length of the string "goodbye" is 7. You only get confused if you imagine that there is somehow a single "state" of "whether the video is playing now" that somehow "changes", which is unfortunately what non-FP programmers tend to do.