The suspect has a knife. Cassie freezes when she sees the glint of the blade and although it's only for a second, it's long enough for the suspect to get the upper hand. It's Rob who manages to seize him, twisting his arm behind his back until he yelps and lets go of the weapon.
"You OK?" Rob mutters to her as he manhandles the suspect into the squad car with more force than is strictly necessary.
"Yep," she says calmly. Rob doesn't say anything else, but she can feel him being more gentle than usual with her, like the way she is with him whenever a missing child case lands on one of their desks. It irks her, she doesn't want his sympathy, but she gets where he's coming from.
"Thanks," she says later, over a large glass of brandy. He nods and squeezes her arm and they go back to teasing each other.