"The... gauntlets, that were in your drawer with the lei and your guns."

Well, she's never seen him do that before, and in true teenage 'got busted in the liquor cabinet' style, she's got a running stream of excuses before she can consider that excuses might get her deeper in the shit.

"I- I was showing Lucius the lei, because I figured he'd know if it was like, a pirate superstition, I didn't touch them or anything, and I figured it was okay because you already showed me inside the drawer?"

Darcy's seen Skulduggery mad once, and she really doesn't want a repeat of the party, ensuing fight and all.