B107 introduces
P104 note:
- legal for any ability with an enduring area effect,
- even if it lacks one or both of Area Effect and Persistent;
- e.g., Obscure with the Ranged enhancement.
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2005 http://forums.sjgames.com/showpost.php?p=78306&postcount=4
Yep, that's fine. Just like when you have Mobile and Homing you need to specify whether the Homing is for the attack roll or for the Mobile enhancement.