Source: Warhammer: The Old World Online Rules Index

Challenges & Mounts
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If either participant in a challenge is mounted, their mount (including the crew of a chariot) must direct its attacks against the other participant. If the rival participant is slain before a mount's attacks are made (because the mount has a lower Initiative, for example), the mount's attacks may be made against the rival as normal for the purposes of Overkill.

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