Why was lord Muu's fissioned clone not affected by the Earth Release: Ultra-Added-Weight Rock Technique? During the 4th shinobi war, during Onoki vs Muu fight. Onoki makes Muu's body so heavy that he can't even lift his hands using the Earth Release: Ultra-Added-Weight Rock Technique. 

After this Lord Muu using his Fission jutsu to become as two people with halved power. 

My doubt is why is the fissioned clone not affected by the Earth Release: Ultra-Added-Weight Rock Technique? The single person becomes two when the fission Jutsu is used and also their power is equally shared. Then is equal part must hold true for the Damage taken also right?
Mū splitted first (using the Fission Technique) before Ōnoki made him (his fission clone) heavier.  

This was the order:


Naruto attacked Mū using Planetary Rasengan
Mū splitted his body while being hit by Naruto's Planetary Rasengan
Somehow no one noticed this
Ōnoki came to his fission clone and made him heavier