Will get a post up by tomorrow, late here.
Khan you know you ran right into his Earth Circle right? I go to all that trouble of trying to throw you into it and you just run right into it for me.
Metz' reaction sums it up.
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It's off to his left and above him (because he expected Khazna to drive the sword downwards into his back like he was holding a giant knife.) until he twists it round to initiate the grapple then it blocks the sword. I had to make a rough estimation because a lot of things in this confrontation are pretty much up in the air. Your character's powers aren't the easiest to imagine in this sort of close encounter.
Also, isn't your character technically indestructible? If he can create these clone swords at the speed of light and then explode them instantaneously I'm not entirely sure how anyone is supposed to actually hurt him considering the only avenue for attack seems to be at melee range. Save for carrying a machine gun into battle, a machine gun would be nice right now. Though Skallagrim nerfed guns in that fashion, so really your character has no particular weakness in this tournament.
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If Tab is standing roughly facing Metz (as Metz is charging his open body) then backwards would be to his right, though it's not really important as the current situation has both fighters wrestling for control, its essentially just a grapple. It wouldn't be that hard to transition from a fore-arm block to a wrist grapple after they made contact, as far as I know it's pretty standard practice for disarming.
Metz isn't really using his arm to block the blade burst, his arm just gets in the way as he's grappling because the arm is between the blade and Metz face. You have to imagine Metz still being somewhat lower than he should be because he's essentially keeping fairly low to strike low at the body, or at least was until the most recent post.
The whole movement is one action, it makes more sense if you imagine him ramming the blade upwards with his right hand while his left twists, faces Tab's and then yanks down while bending. Not that Metz really has the strength to outright overpower Tab, though he is slightly stronger I think.
I'm not sure how your character's right arm would be in the way unless we're imagining the scene differently somehow. Metz is driving his blade up immediately after his jab, which took place simultaneously to the blade exploding. (which in turn required Tab's own arm to be up away from his body)
The only way Tab's arm would be in the way would be if he completely overcame Metz strength and managed to yank his arm back like he intended in the time it took his knife to richochet and shoot upwards, which seems unlikely as Metz is the stronger.