Colonel Stone: [to Tarzan] Not too many people go running around the jungle in a loincloth.
Sorda: [to Tarzan] When I strike the drum, the horses will be driven in opposite directions. When the sound of the drum has faded from the air, I will strike it again. This, I will do five times. In all that time the horses will be pulling with all their strength. If you can resist that strength for the five strikings of the drum, I will then know that you are Tarzan.