You lent me your spare snorkel and we followed a turtle

My snorkel strap broke at the reef off Puerto Morelos and a man floating nearby handed me his spare without a word. We ended up following the same turtle for twenty minutes. On the beach we compared how many fish we had counted. His number was eighty. Mine was thirty. We have a standing swim every Saturday and the count has still not been settled. Last week we agreed on a number by splitting it. We both cheated. We both know.