Source: Warhammer Fantasy: 8th Edition

Jump Up and Down
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Before he attacks, the Giant must test to determine if he falls over. If he falls over, work out where he falls and calculate the damage. Any Wounds caused by the fall (on either side) count towards the combat result. If the Giant remains on his feet, the target unit sustains 2D6 Strength 6 hits. Work out damage and saves as usual. A Giant that Jumps Up and Down in one combat round will automatically do so in the following round if he is able to, assuming that he did not fall over in the previous round. A Giant that starts to Jump Up and Down will therefore continue to do so on the same target until he falls over, the target is destroyed, or the combat ends.