remember that she doesn't care about any humans besides Seika, she knows that she looks like his past apprentice that offed him and still only thinks what's best for him from her viewpoint
He angry because she's being treated just like he was used in his past where being a hero does not matter when politicians are involved. He should not be empathic towards someone he means to use but his past misfortune has overlapped but not with him at the crossfire.