The Smile Virus

According to the lore, the Smile Virus may spread through bites from an infected pony, leading to symptoms like weakness, sore hooves, bloodshot eyes, and inflammation of the mouth and gums.

( Make your character. The pony can also be infected. )

You were currently roaming around Ponyville. And then you notice how dead and silent the surroundings are. After a while, you spot an infected pony. It seems to be at stage 3. The pony did not notice you yet. What will you do?