"Your confidence will be the death of you. Your deceptions will." The Master's attitude, his plans are getting to her-- Riven's tone is as sharp as her sword and equally unforgiving. She can see how it all unfolds (and most likely in his favor to boot) and, well.

She doesn't like it. She even takes a step forward, unconsciously, not meaning to be this aggressive, but-- "I can only hope it comes sooner than later."