You could have seen these in a video, you could have done it yourself, your friend could have done it, no matter. Just post your favorite Crucible kill on this forum.
Mine is a video I saw. When turning around a corner in a sparrow (Combined Arms) an enemy got out of another sparrow and got rammed in midair.
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Just threw a knife in a Titan running up the stairs on Firebase Delphi. I went perfect in that one too.