Are you sure? I am sorry... By letting you be harmed, I broke my promise already!!

[He whimpers, and he's so distracted that he almost misses the two roughhousers until the girl points them out.]

Ah! Do not worry! I can deal with them without hurting them... much!

[They're busy dueling with each other so it's relatively easy; he releases Lucy's hand for the moment, kneels down and sweeps a leg across the floor - and across their legs, tripping them so that they both tumble onto the floor. While they regain their senses-]

Now, run!!