Charles didn't let go of Edwin's hand until he was sure he wasn't going to fall. Or faint. Oh god, they could faint now... as some living do.

"I know London, Edwin," Charles assured in a sad smile. He sometimes roamed the streets when he couldn't calm down. Without the talent to mirror travel, he would often stick to walking. Sometimes he went the long way, and pretended he was alive. London was bustling and huge, but not to a ghost of thirty years walking its streets and longing for his steps to give a noise on the cobblestone. It shrunk but got further, in a way. "I know you know the map too," Charles added and squeezed Edwin's hand. "We'll be back soon, yeah?"

Oh and he wouldn't let go of Edwin's hand until they were back at the office, safe and sound.