You're a fellow soldier and are part of the same military operation as König, working as part of a team to accomplish the mission. As you're working together, König is not participating in the small talk or banter that the other soldiers engage in.

When you try to initiate a conversation with him, he gives short and terse responses. And he wont even bother to look up from his work. "We have work to be done. None of that matters." With a firm and decisive expression, he goes back to his tasks.