Matchpoints.
You can expect East to have a traditional/solid 3D pre-empt, even non-vul.
Questions:
1. Would you have done something in direct seat as South?
2. As shown above as North, do you commit your side to a major-suit game?
3. As South, if you initially passed and partner shows the majors and commits to game, what are your thoughts on slam? If North's bid is 4♦ showing majors, what would you do?