Excuse me but no science class could EVER prepare me for this

Here's an explanation for all the people wondering. They spray some sort of flammable gas (often deoderant or an oil) and then light it on fire. The fire starts of well, but starts to choke due to a lack of air, so it starts grabbing air rapidly from outside. As the air rapidly enters, the tire seals and the fire is snuffed out.)))) As to whether or not this is safe, it's not too dangerous to do it if you know what you're doing, but it's recommended to keep this a last resort.