Grey Dolphin Games
For purposes of movement, I don't think you can consider the Zard beast as a Martian pack and apply the Martian pack movement rules.
If you do, that makes it impossible for the Zard beast to move through a Martian pack. Therefore, there would be no point in having the rule that the "raging" Zard beast tramples the Martian pack it moves through.
Yea, no, the rage ability says that it must move first and must move to an adjacent space if there's a hero there and that any martians crushed go away. This ability overwrites the normal movements rules. You still couldn't force a normal pack into the zard's square. Nor could you force the zard because Water Bucket doesn't work on beasts (I think).