I'd consider reducing the threat range on the misfire to figures adjacent to the targeted figure:
Quote:
Reduce Beetle's Range number by 1 for each Wound Marker on this Army Card. Any time Beetle attacks a non-adjacent figure, if you roll more shields than skulls, your opponent must choose another figure adjacent to the defending figure and you must roll an unblockable attack die against the chosen figure.
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3 spaces is pretty far off, in a Heroscape context, and I think it becomes tricky to play around at that point.