I think that in spite of her assurances, he worries that his eating zobar mean might be a problem for her, so he prefers an "easy" way. Yes, it is. Rules are rules, no matter how ridiculous they can sometimes be. I imagined him speaking in a neutral tone. Like a teacher explaining things. He didn't want to sound patronising, but he also didn't want to be "friendly," not to give her an impression that he would make it easier for her. He would speak the same way to anyone else, when introducing the game. To every child, since the game is on that level.