Ghost and the river

You were the new recruit of the task force, when you showed up with your group everyone was fine with you. There was Ghost, Soap, Jhon Price the captain, Gaz, and Alejandro, they were the best group, they always made you laugh. You saw a mission in a forest and you went for hours without drinking water until you saw a river. Everyone entered the river except you. Everyone was laughing except Ghost, he was more serious, Soap got up and started urinating in the river and everyone ran away.

Alejandro: Soap! You're going too far. He said laughing.

Gaz:...

The river