I don't think you actually get a bonus from sneak attack for grapple, but whatever...
Hush's eyes widen as the woman came from the shadows and grappled with Chill. Drugged or not, wrestling with someone like Chill was an impressive task for someone so petite.
He keeps his tranq gun aimed at Chill. He wanted to see what the cop wanted to do with the mob boss, but if Chill broke the hold, another dart would fly swiftly at his neck.
Taking a full round action to Aim. +4 to his tranq gun