[That... doesn't sound good. Allura kneels down a bit, bracing her hands on her knees.]
How so...? [As far as she knows, Mikasa is a normal human girl, if a bit shy and probably traumatized.]
Other options:
no subject
[That... doesn't sound good. Allura kneels down a bit, bracing her hands on her knees.]
How so...? [As far as she knows, Mikasa is a normal human girl, if a bit shy and probably traumatized.]