Drag and Drop with multiple targets? David's vid

Hi all, 

I'm trying to improve my drag and drop skills. I was watching this video from David A., and at timestamp 52:02, he shows dragging an item to four drops. It was my understanding that there could only be ONE drop target. 

Does anyone know how he did this, or maybe he shared this file somewhere?

https://www.youtube.com/watch?v=A7ib5qxSQao&t=3113s

Thanks!