spirits in HEAVEN pv

[jasonrey]

i just discovered that the spirits in HEAVEN pv, when they walk in the middle, they are not half-transparent, but when they walk to the side, they turn half-transparent. there is some ppl as an example in the pv where u can see him walk from the right side, which is semi-transparent, then walk to the middle part, he turn non-transparent, then when he reach the left side, even before reaching left side, he turn to semi-transparent... why? anyone notice?