Oh they’re notching her tail. See the little bit taken out? That tells whoever catches her next to let her go– it’s a sort of “hey, this is a reproductive female; let’s keep the cycle going by putting her right back in the water” signal. The bit will grow back in 2-3 shed cycles, which takes a couple years.
They know she’s able to reproduce bc she was caught with eggs.
The line delivery, the acting, the fact that I can hear this without sound, the way they’re treating it as though this is a murder trial, and Mr. Electric’s reaction to this are part of what makes this scene hilarious