Just in case the direct link doesn’t work properly: https://i.imgur.com/IgbRs9y.mp4
PS: The mushy thing they’re standing on might be a cluster of Giant Salvinia, a floating water plant that can create extemely buoyant “islands” up to 60 cm thick.
EDIT: More likely a floating mat (Thanks again!)
I may mistake it with something but basically, it can trap you underwater. It’s muddy so you can get stuck and…well. Recall the part where they stand on slowly sinking part.