i would tell that river monster "river monster, i'll be back in the middle of august during the drought when water levels have receded. this pool won't be so deep then....and you'll feed my whole village."
the end.
River Monster says, "Ua li ntawd mas, phooj ywg. Cia kuv sau hauv kuv phau calendar kom kuv nco qab. Wb mam sib ntsib thaum lub yim hli os phooj ywg qub zaub. Ua tsaug koj ua siab ntev tos thaum ntawd. Kuv mam noj ntses thiab miv ntau ntau kom kuv muaj zog es thaum wb rov qab sib ntsib koj tsis muaj chance against kuv. Muahahaha."