The Doctor was looking at them. He knew this would be messing with thier heads. He wished he had something to help them see there wasn't anything there.
He looked at Jack who was throwing up. He just rubbed his friends back. "Its ok, you didn't hurt me that much." he helps Jack to his feet after. "It will be ok."
The Doctor goes and hugs the two girls again and Jack goes and hugs them too. 
"Doc... I think you should take my gun right now... I don't want to kill any of you " He gives it to the Doctor.