The English copy of the rules that I have says to move it to another tile. There is no mention of another feature.
First off, your post lists partials of the CAR 6.4 rules which inadvertently confuses readers (including me, laugh).
In my mind the fourth sentence would be better worded as follows:"If the Mage or and the Witch is are already on a land tiles, the player must move one to a different tile."
"If both figures are in play, the player moves one of the figures to a different feature tile."
The English rules do not state that the figure has to move to a different feature, although I would agree it would make for better game play and should be the intent. If HiG states now that that is the intent then it is the case that the English rules (and perhaps the original Geman) sorely missed that point.
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