beta
Zeke might be presented as a laid-back person who doesn't know kindness, but it's pretty clear that he's going to towns that had major disasters from his past and is handling them in his own way. While Gren is clearly more of the type who wants to have the same future as he had, a Hero.
The first town would most likely have been sacrificed if the St.Lady didn't met Zeke. And thus she would have greatly felt guilt and regret over. To which Gren would most likely heard of in the prior time line. That's why he assumed that she was sad, and was most likely waiting for the opportunity to use this to form a bond with his future teammate.