Translation of Rechenschwäche

We do not see the spider eating the moth, we only see a yellow spider sitting on a red flower holding a brown moth. But we know what will occur: There will be a cruel and nasty act of the nature.
We left on time and the route included some nice beach towns along the coast, such as Tulum and Playa del Carmen. Behind me sat two very cute girls who started to talk to me about life in my country.
The young women rowed towards us and tried to sell food and souvenirs. We were not interested and she tried to block us and prevent us from swimming back to our vessel. So we dove beneath her.