Notice how there is no evidence the cart would move without the vacuum
Also, the retard can't distinguish between the near-vacuum of space and a vacuum cleaner
In the absence of other forces, air moves from high pressure to lower pressure
A vacuum cleaner creates a lower pressure and the higher pressure air goes in
Vacuums don't suck, unlike this fucktard's mom who does it for $20
Furthermore, the implied retarded claim is "you can't have thrust without a vacuum" which is false
The ignited expanding gas inside the engine bell is the green P in the image
It is exerting a force in all directions
If the engine bell was closed nothing would happen - pressure equalizes
But when it is open, the gas escapes and a force imbalance is created
The force to the right is no longer countered by the left, so thrust is produced.
There is no outer gas required for this - the expanding gas is pushing against the right wall of the engine bell
https://www.youtube.com/watch?v=kAZMBAVRsCoAlso
https://youtu.be/_18RZDwnX4U?t=406And
https://youtu.be/yRfDwkHPVeg?t=294 
