The one thing that still worried John (more often than the life-sucking alien vampires, if not quite on the same level) was that everyone spoke English. Even the life-sucking alien vampires spoke English. He'd be the first to admit that he knew nothing about the way language develops, but he couldn't help but think it a little off. He had a sneaking suspicion that he'd missed some crucial briefing, but it was too late, now, to go asking for an explanation.
Not that he wasn't grateful. It made it easier to tell when they were being threatened.