Sinclair makes a conscious effort not to laugh at the brazen way Jack speaks to the girl. She doesn't appear to understand what's happened or what's happening, and she just ejected the diluted contentes of her stomach onto the floor.

Which Jack is.

Collecting.

In a syringe.

Well. Sinclair has seen less hygienic things in his time, and ADAM probably can't harbor bacteria. Right? Sure. We're gonna go with that.

Carry on, Jack.