[This is good broken glass in a bar. This has nothing to do with smashed bottles being used as weapons. This is for fun and amusement and seeing a fit girl with moonlight in her eyes.
Solemnly, Sirius raises his wand, and taps the edge of the bit of glass that she's holding. He says the spell under his breath, so quiet it'll be missed--especially in the excitement that's taking place now, because the bit of glass starts to glow with a gentle light, blueish white, a bit like a fairy-light on a Christmas tree. He taps it again, carefully, and then leans back quite quickly, anticipatory--]
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Solemnly, Sirius raises his wand, and taps the edge of the bit of glass that she's holding. He says the spell under his breath, so quiet it'll be missed--especially in the excitement that's taking place now, because the bit of glass starts to glow with a gentle light, blueish white, a bit like a fairy-light on a Christmas tree. He taps it again, carefully, and then leans back quite quickly, anticipatory--]
All right, let it go--