She's actually not paying attention to the way he's looking at her at the moment. She's trying to downshift from what she thought he looked like under those suits to the insanely muscular arm she's looking at and pretending she's inspecting very thoroughly. Seriously, how did he get these arms? Is the rest of his body this built? What does a tech genus need with a body like that and why does she seem to have a type with men. This may be a muscle caused existential crises.
"It's um, red." She bits her lip a little. "But I think you'll live." Seriously that's, a lot of muscle.