That forest was crispy dry, almost dusty in recent weeks. One spark could burn it all down easily. We had... 2 properly rainy days through whole summer? Few thunderstorms but they were very local, and all of them avoided directly our area and that forest like plague.
At least those crayfish managed to survive as I've seen 2 last week, they are more susceptible to water pollution and some brutal fungal infection which can be brought from other streams and basically sterilize whole stream (happened in other parts of our canton around Lausanne). Water somehow didn't stop. Back where I come from in eastern Europe their local crayfish weren't often so lucky - streams bone dry.