The scene where the hostess realizes a snake is in the room this is a form of dramatic irony. That is because we know that there is a snake in the room while the character thinks it.
In the scene where the American is counting to 300, the Cobra is under the table. I thought that it wasn't going to take the bait and still strike someone but the Cobra took the bait.
The theme of this story is that your gender has absolutely no effect on how courageous you are. The hostess and the American both showed great courage in their actions to protect everyone from the snake.