How do you think this effect was done?

In this ad pants are ripped off people at a barbecue. How do you think they achieved the effect?

https://www.linkedin.com/posts/goodoil-films_good-work-hamish-continues-to-wear-the-activity-7393492879039500288-4i8o?utm_source=share&utm_medium=member_ios&rcm=ACoAAAewMl0BVWrB3e_xxD2sDjWQYpFWm3qrSOA