Source: Warhammer Armies Project: Unofficial 9th Edition

Jump Up and Down
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The Giant must test to determine if it falls over. If it falls over, work out where it falls and calculate damage as already described. Any wounds caused by the fall count towards the combat result. Otherwise, it will inflict two Stomp attacks. A Giant that starts to Jump Up and Down will therefore continue to do so on the same target until it falls over, the target is destroyed, or the combat ends.