I guess they could have been making some interpretations of their hand gestures, deliberately ignoring that Venezuelan ~~fishermen~~ drug smugglers are unlikely to know the hand signals of American military?
When American photographer Carl McCunn was stranded in Alaska, he was discovered by a state trooper plane. He cheerfully raised his fist in celebration. The plane left and never came back. Between this incident and perishing there he read up on hand signals, and learned that he had inadvertently signaled "all is well".
Way to give him ideas...