He finishes injecting the blood, turns back to face Steve for a moment, and nods calmly, not a trace of fear or doubt in his expression. "I'll take that risk."

Turning to adjust the bags of fluid hooked up to their IVs, he shrugs with a thin smile. "Would you believe it's from history? Not a history that's popular or particularly encouraged, but even so..."

Olivia gives Steve a sideways look that's half alarmed, half silent question if he's wondering about this guy's sanity as much as she suddenly is.

...because kidnapping them and dosing them with blood and Cortexiphan in the first place is such a great mark of sanity.