During the in-between footage, it looked like the one guy had victory arrows in his quiver... maybe not flatlines, but still a light arrow right?
To me it looked like the arrow hit bone.  Any arrow would've gotten more penetration than that on a rib cage hit... even at IBO weight you'd think.  You say the tekans are junk, but even "junk" would go through rib bones without a problem.  I shot the tekan IIs for a few seasons and killed 5 deer with the same head, same blades... 5 pass throughs.  I think he hit shoulder bone myself.  The other guy got a pass through at 42 yards with flatlines... the first shot was definitely closer than that... had to have hit something hard.
What I don't understand is why those wing wangs let the deer set over night after the second shot.  It was obvious from the footage that the guy made a perfect double-lung pass through.  WTF???!!  Go get the damn deer.  Why risk letting 'yotes tear it to pieces overnight when it's easy to see you made a good shot?