A topic change that he'll accept. Even if they did mull over some unknown battle now, there wouldn't be a whole lot Childermass could contribute. He'd do fine in a fist fight (for the lack of guns here, he couldn't count on any pistols), but offensive magic wasn't a card up his sleeve.

A different problem to fix at some later time, that.

"If it's a tempting enough stop, you might be able to try your luck. You never know." Though Childermass isn't sure he should encourage something like that. Of course, he's also sure enough that Strange doesn't have anywhere particular in mind, anyway. "But as varied as the stops must be, I wouldn't spend too much time dwelling on it. They can't all have cars."