The Doctor was looking at Jack. "Sick when its meant to be Arwen's birthday. Though guess things went bad with the Ferris wheel incident, I will make that up to her when I have more energy and feeling better."
He really didn't want the Master finding her. He snuggled up to Jack. Owen gets the needle. Knowing the time lord is nervous, he waits till he can take blood when the Doctor is less tense, as knows it hurts more when tense.
He takes the blood and is thinking, He noticed the Doctor closed his eyes "Its done Doctor."