Hmm, so this?
Arc (Su): As a swift action, a lightning quasi-elemental can move up to 180 ft to a location adjacent to any grounded object or metal object weighing at least 5 lb (including creatures wearing metal armor). If the quasi-elemental succeeds at a ranged touch attack roll against the object, it also deals electricity damage equal to the damage dealt by its Electricity SQ (see below). If a lightning quasi-elemental attempts to arc to an object that's not grounded or metal, it randomly arcs to an alternative grounded or metal object within 30 feet of the target location. The new destination must be within the arc's 180 foot range. If no valid destination objects are within range, the arc fails and the quasi-elemental does not move.
What if we simplify the "failure" bit some more?
Arc (Su): As a swift action, a lightning quasi-elemental can move up to 180 ft to a location adjacent to any grounded object or metal object weighing at least 5 lb (including creatures wearing metal armor). If the quasi-elemental succeeds at a ranged touch attack roll against the object, it also deals electricity damage equal to the damage dealt by its Electricity SQ (see below). If a lightning quasi-elemental attempts to arc to an object that's not grounded or metal, the arc fails and the quasi-elemental does not move.