Southern Company Engineering Co-Op interview questions

I got an interview at career fair in college in 2 days. I applied for process engineer position in GA, FL. it was smooth. asked many questions about leaderships and intuitive aspect.

I was referred by another intern so this might be a bit different than usual. I emailed my resume to my potential supervisor, and we scheduled a time that I was able to come in for a few hours. I met with my direct supervisor and we talked - very casually, with maybe a few behavioral questions thrown in there - for probably 30 minutes. Then I did a sort of round robin with the team, going from one person to another to see what it was they did and I assume so they could learn more about me. After about 2 hours we passed the executive that was in charge of their department and after introductions I then went in his office for another 30 minute chat. This wasn't planned at all so it was a but more high stress, but he focused on very casual topics with a few subtle behavioral inquiries. After that I think I waited a week or so and they called me and offered me the job.