A tail it is. Its actually a very nice tail, unfortunately attached to a distinctly brown body which Syl will notice if she stares long enough at the moving figure. The translucent appearance to her body begins to fade and the creature's ears perk upward once she realizes she's been noticed.

She completely stops moving, not even turning to see if someone was still there. Bloodsnap would wait a minute or so for the sound of footsteps before making her decision.