Daine blinks in surprise at hearing Andrew call him 'Master.' Seems a bit much to her... and then her eyes widen as it hits her: he's made Andrew a slave. That's why Andrew's trapped at that desk and calling him 'Master.'

The rap on the nose is the final straw, and she rears back with an indignant huff. She's not going to let this person enslave her friend! Let Andrew go! she snarls, lashing out at the Master with a heavy paw.