I know I shouldn’t think about it too hard, but the way Moot wrap the chain around the island and then pulling it that way, physically speaking should make the island go like a spinning top.
So, perhaps she held on to both ends of the chain that wasn’t clearly depicted…. (The chain did not look like it was connected to an anchor on the island, though maybe it does just not shown)
Anyway Reni is cute and thankfully so is the snake, so I’ll stop thinking.