The Magi are having a meeting in a less than friendly environment...
Flambeau: "Man, I need a drink" "Hey, wench!" (Serving maid) "Get me a drink!"
She returns with a cup of water, and states "Here's your water{dripping with malice}...", slams it down and leaves.
The Verditius laughs and says "Hope you like that water"
The Flambeau hands the cup to the Mercere and says "Here, check this out."
The Mercere takes the cup, and casts Perdo Aquam on the cup. Handing the empty cup back, he says "Nope, just water."