You can't help but see why he would worry about this haha. 

Logan: *looks at Clary and nods reluctantly* I know, but I couldn't help but worrying a little bit about it. It's bad to get hit by a bus, but to have it thrown at you is even worse. I'm okay now that I know it isn't as bad as it sounds. *looks at Dahl* No, I'm fine with it now.

Everyone: *continues watching the girls*