by sigmazero13
You cannot move units or heores out of activated areas.
This is true for units, not for heroes. The Revised Edition Rulebook states, on page 16: "Heroes can also freely move out of areas containing friendly activation tokens." And again, on page 17: "Heroes are unaffected by activation tokens."
So you could use the secondary of Mobilize to move the same heroes again, as long as the second area you activate is within range of where he ended up the first time.
As the above poster states, Heroes are NOT considered "units" unless a card specifically says otherwise (like Valor of Heroes). The Frequently Used Terms on page 15 says this outright, in the "Unit" definition: "Any ability that applies to units does not include hero figures unless otherwise specified (heroes are not units)."