She worked her hand up and down, watching his reaction.
She watched his reaction; he was less than happy with her answer.
He watched their reaction for a moment and then continued.
The thing is, watching his reaction, I don't think he saw us.
Try to do it, when there's nobody around to watch your reaction.
He felt them stop in the doorway, and turned to watch their reaction.
He flung open the door, then turned to watch his son's reaction.
That's when we get to host someone from one of the Northern states or another country and watch their reaction to the heat.
It would be interesting to watch their reaction when they found the strong force farther behind.
"It could also be a staff member," I told him, then watched his reaction.