The knots in our laces represent the past and previous mistakes holding us back (the karma): the fork stuck in the road that makes us fall during our journey.
We then end up going back to the persons we departed from just because going back is easier than going forward with life.
This leads to confusion and jealousy, giving your heart away and using other people that than you crush (throw out the window as if they are disposable).
To make your heart race, you need to find yourself first (heart it races alone).
I don't know I'm just guessing. But it does make sense.