Even though Ferric Summons says "unsecured object," I think it's reasonable (and cool) to be able at least try to pull a secured object (e.g., held) that weighs less than you to you. Suggestion:
If the held object weighs less than your maximum weight, make an opposed Willpower to opponent's Strength test. A success means the object has been pulled away from your opponent. If the object is lightly secured (e.g., holster, pocket), make a Willpower test at -10.