...so much for subtlety... As everything went into chaos, the Lady immediately readied herself to intercept any idiot guards or wanna-be heroes among the regulars who attempted to intervene when they heard the clamoring.

And, for that, her hand dropped to a bag of marbles hidden under her cloak...

Spoiler: OOC
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If any NPC tries to rush in to aid Derek, she's letting loose her bag of marbles to impede 'em. They'll need to make a Balance check of 15 or they'll fall (A&EG p24).