Extrovert: tend to be gregarious, assertive, and interested in seeking out excitement. They tend to think out loud and cannot solve things in their heads as well as introverts. However, it should not necessarily be assumed that just because one has many friends that they are an extrovert.

Introvert: in contrast, tend to be more reserved, less outgoing, and less sociable. They are not necessarily loners but they tend to have smaller circles of friends. Introverts have an easier time solving things inside their head. Introversion does not describe social discomfort but rather social preference. An introvert may not be shy at all but may merely prefer non social or less social activities.

Definitelly

She may have been frightened of John Smith at first, but who wouldn't have been?

^ Totally agree. He was white, which was scary and strange to her, and looked like he was made of metal. And he'd tried to shoot her which is scary enough.