You should cover your mouth when you sneeze.
Kyra is feeling a big sneeze coming on while sitting on the bus.
Kyra wants to respond to the oncoming sneeze.
Kyra covers her mouth with the crook of her arm when she sneezes.
Kyra sneezes freely out into the open area of the bus.
Kyra contains her germs to her arm preventing them from reaching other people.
Kyra will spread her germs to other people around her.