Shell Assistant Engineer interview questions

Told to sit and wait one of the interviewers was late- he didn't apologise when he finally arrived but the boss did. 2 on one interview. Routine competency questions and background knowledge checks. One interviewer was extremely rude and abrasive and asked very pointed questions to the extent that I suspected it was a ploy so I played it cool and used my background knowledge to answer questions. It was almost like good cop/ bad cop! This went on for around 45 minutes before both interviewers nodded to each other and the interview ended. I was introduced to the other staff members and driven to the station by the guy who had previously been abrasive and congratulated on getting the job! Culture- laid back.