Our Denver FO IO was complete opposite: zero emotions on his face, not friendly, no greeting beyond the formal 'hello', didn't even look like he was listening to any of our answers, started the interview by grilling my husband about why he's there with me...
Glad your experience was much more pleasant!
My husband has exam anxiety, and when asked about how we met, he started from so far away that about 5 minutes into my husband's rambling IO had to rush him to the point when we actually met 😅 I was mortified.