REAS stared at his brother's nonchalant attitude and suddenly felt the urge to pull out his hair because of frustration. But since he didn't want to get bald, he could only scratch the back of his head. If he didn't know him better, he might really think that the other was not taking his safety seriously.
But he did know Astrid. And he's not someone who would joke about something like that. So, when he said that he would have a fallback strategy no matter how things turned out, he had no choice but to believe him. Because once Astrid decided on something, he would definitely follow up on it with actions instead of just words.