When electricity hits a grounded metal object (which, unless Wulf was holding a SP entirely off the ground, was the case), it goes through the object and "grounds out". True, a good bit of it goes into Wulf (ie: deny Evasion, he took damage). However, there's a decent chance NOT ALL of it went into Wulf, and a Reflex save is the best measure of such luck I can think of. The desires of the conductor have nothing to do with it.
Now, if those Steel Predators has insulating booties on their feet, I can see it happening the way Dinkeldog explained it. That is, if the SP's weren't touching the ground with anything but their feet. The electricity would then ground out entirely through Wulf, and thus he takes it all. They'd have to be declawed, though, because otherwise the rubber booties get shredded real quickly!
Of course, the Lightning Bolt spell doesn't seem to work like real-world lightning (ie: it progresses past/through metal objects to the limit of its range). In this case, I assert the SP's don't conduct it (otherwise it WOULD stop), and the issue is whether Wulf wiggled out of its way somehow. In my game, this would be a Reflex save, with Evasion enabled, and the target loses his Dex bonus to the save due to being grappled.