These odd bars are there to facilitate the speed-up (that’s accelerando for you lasagna lovers), like how she says “I’m picking it up.” The “bridge” here could be considered a modified chorus. I’m calling it a bridge, though, because of the material it mixes in from all of the sections. This mash-up really is its own thing here, even though it introduces no new material.
A narrative takes it further, beyond the facts into something that pulls fans on a more emotional level. It’s how you got to where you are, the struggles you’ve faced, how you’ve overcome those struggles, and where you’re going.