The Doctor had figured Owen and Toshiko had to be mates. He wasn’t sure what sort of relationship. It had to have a meaning because Owen dropped his medical bag. The Doctor was to slow to react to catch it. It could be the human body doesn't have that instinct to be quick.
The Doctor bent down swooped up the medical supplies hanging from the bag. He tucked the supplies back the medical bag. He closed it up and stood up. The Doctor held on the bag giving Owen time to gather himself.
“Sorry, so sorry,” the Doctor replied. “Are you goin’ to be o-kay?” He put a right hand on Owen’s shoulder to give him comfort.