Looking into Shane's eyes, Frer was unsure what to think of the youth in front of her because he seemed unruffled by her strongest revelation of blood lust killing intent which not even her sisters or Aisha had been capable of fighting when they had to face it for the first time.
Adding the fact that Shane was barely at the 3rd Apprentice stage, she and the other valkyries were sure that the youth in front of them had to belong to a special origin, which their Captain was most likely aware of.
Otherwise, it would be weird for Aisha to ask Shane if he wanted to join them even if it was only for a picnic as well as her nonchalant behavior around Shane even though he couldn't be described as polite or anything remotely close to that.
It felt just as if two new friends were around each other.