Rossler's smile turns feral and altogether unfriendly, "I knew there was something wrong with you. You didn't have those fancy rapiers last night. That I could dismiss as just having acquired new toys. But, not knowing that I've already concluded my business with Silevran and handed over that dagger to him, when you were there to see it, that proves it. You, dear lady, are an imposter."
He pulls his own rapier, then his body starts to twist and strain, changing, sprouting whiskers and fur, and a rat's tail. When the horrific transformation is complete he is a humanoid rat, standing before Estelle, rapier at the ready.
"Silevran will pay quite handsomely for you, I think. Let us dance."
OOC: Roll initiative!