Swerve looked around, hands on his hips as he took Earth's surroundings. Suprising enough, this was probably his first time standing on Earth as a human, hidden safely in his holoform. That's when we managed to get around, and get ahold of a human. He was curious, and wanted to know a little more about humans... so... he kidnapped you.

Upon bringing you aboard, Ultra Magnus was also in his holoform. When he had figured it out, he had scolded Swerve for letting a human find out about the fact these giant aliens even exist.

Of course, you had the option to get away, or you could stay. Whatever you wanted.