Now, wait a second. If this guy is so powerful, then why doesn't he just invade us?

8 seconds sound clip from the Mortal Kombat (1995) movie soundboard.

You can hear this line at 00:19:16 in the Blu-ray version of the movie.

Quote context

[...]

- Listen. What you're about to face is vastly more important than your ego, your enemy or your quest for revenge.

- You have embarked on a sacred mission. You have been chosen to defend the realm of Earth in a tournament called Mortal Kombat.

- Defend it from who?

- Your world is but one of many realms. One of them is a forsaken land called Outworld, ruled by an immortal who has crowned himself emperor.

- Now he seeks a new world to conquer and enslave.

- Now, wait a second. If this guy is so powerful, then why doesn't he just invade us?

- To enter the realm of Earth, the emperor's demon sorcerer, Shang Tsung, and his warriors have to win 10 straight victories in Mortal Kombat.

- Heh. They have won nine. This will be the 10th tournament.

- A handful of people on a leaky boat are gonna save the world?

- Exactly.

- The essence of Mortal Kombat is not about death, but life.

[...]