It means: “Hermione, you better hurry up before young Master Potter gets away.” It’s a simple statement of — if you are a young Nubian princess, and you challenge your secret crush to a foot race — and you out run him as if he is “running in sand…” (Pribek.net) then he will find someone who doesn’t humiliate him so much.

However, if you make a spit handshake before you throw him down, put him in a half-guard, and rain down elbows on his pumpkin head, then the defeat is worth the wait… ask any brother who grew up with an older pugilistic sister.

So, implicitly it alludes to the old adage: “the means, what ever they are, are justified because of the preemptive agreement that you will end up on top…” and that is probably not what you were wanting to hear. You probably thought it translated something more romantical.

A very revealing post. Good work, and worth the wait.