This is what happens when humans make a transforming space robot and they haven't been exposed to Cybertronians, Optimus. Also at the mention of being curious, Miria cocks her head slightly in a confused gesture.

"This Unit can understand Optimus Prime's curiousity, as this Unit is also curious about," a pause, as she's recalling the right proper word. "Cybertronians, as this Unit has never encountered such extraterrestrial species."

And she simply glances at her injured arm as if it was an after-thought.

"This Unit encountered a hostile upon arrival. The gold cre-- Cybertronian is a minor threat, that is all."