This is a video clip from a copyrighted video game. The person who uploaded this work and first used it in an article, and subsequent people who use it in articles, assert that this qualifies as fair use under United States copyright law, where:
The sample is being used for commentary on the video game in question, and contributes significantly to the encyclopedia articles it is used in (listed under the heading "File usage" below) in a way that cannot be duplicated by other forms of media.
There is no adequate free alternative available.
A more detailed fair use rationale may be provided by the user who uploaded this video.