At the time... it depends a bit if I was near a public right of way and what I was up to but generally asked them in robust anglo saxon why they were trying to throw things in part of the water source. Generally I have found my involvement makes things worse, so whoever filmed it did the right thing.
These people say "We Would love to Hear From You"
Ed Davies 07852 963 432 Director <-- the one most likely to be involved in actual operations and logistics, staff and management
Will Horner 07730 218136 Director
Anthony Pryce 07807 553 059 Secretary
They don't own land, they pay the farmers and this is a new venue for them
"Cwm Rhaiader (meaning ?valley of the waterfall?) Estate near the village of Machnylleth, in mid Wales, the Dyfi Falls shoot is a real gem. The shoot is a brand-new addition to our portfolio for the 2020/21 season"
It is actually quite plausible that this is a gamekeeper who is new and has been sacked. It wasn't one of the 3 people listed above
Maybe someone could ask Ed if he has had the carcasses removed from there and if not does he need help (for a fee, which would be passed to mountain and cave rescue) I don't live locally but if I did I would offer
Edit: just realised this is last weekend of shooting in the season (had to Google, it's not on my social calendar!!) So a temp shoot worker being sacked ending say: Wednesday would mean nothing at all