Boys Doing Drugs?

As I had to go to the bank in Antrim, thought I'd walk round to the Six Mile Water river bridge afterwards and blip something scenic. Instead my attention was attracted to these two guys who were Under the Board Walk, filling a plastic bottle with water from the river. Intrigued, I watched as they then proceeded to fill the bottle with what looked like tablets. After a good shake they began sniffing the contents, but by now I had attracted their attention, so I made myself scarce.