For customizing the set specifically for the needs of your game, you can cut up the animation in MayaLT, 3ds max or Blender. All the source fbx files are included in “SourceFiles” folder (not visible in the Editor, access through windows). Just import the fbx of in-place jump to a 3d software, trim the beginning part on the timeline and export back to fbx.
You can also cut the animation up in AnimMontage inside the engine.