He could always just instant transmission Crota to Narnia or wherever the hell Crota belongs....
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If he doesn't know where he's from where's he teleporting him too? Let alone actually fighting him. Sure he could lower his shields but I doubt he'd think to use his sword against him. Odds are he'd break it, toss the pieces (possibly blast those too) st keep trying to hit him with a kameh ha meh ha.