[link to original on tumblr]
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In the first verse, there's the line "But something always holds me back." As if to mirror the "hold[ing]… back," there's a caesura between "always" and "holds."
In the second verse, there's a similar but opposite line: "But something always keeps a hold on me," which - along with directly opposing the line from the first verse - doesn't include a caesura. There're no pauses in the line, and the continuing forward helps to impart the "keep[ing] a hold," as if the lyrics are being pulled along with the rhythm.
So those two lines are opposite in what they say and in how they're articulated.