The change of tempo is so sudden that even Cragen can't see it coming in time to play it off, to work it into whatever symphony he thinks he's playing. He can't block his face, he can't even turn his head with the blow, he just takes the full force of the punch to the jaw and topples dramatically off of his stool in the process. The clatter of the wood against the tile, the thump of his body, the surprised grunt—combined it's enough to make everyone nearby suddenly freeze and stare at the source of the commotion, with gasps and mutterings bursting into the air.

All this in a matter of moments.

Crabb, for her part, is stunned into inaction for all of two seconds before she's off her own stool and throwing a punch back at Watson. She doesn't immediately see the aftermath of the first strike, you see: the way there's now what seems to be skin hanging loose from 'Tom's face, yet not a drop of blood beneath it. She just sees Watson punch Tom, and reacts accordingly.

Probably not the best look, from an officer in her dress blues.