Regarding Necrovalley and Premature Burial

[Nocturne]

Myself and a friend are amidst a disagreement regarding Necrovalley and Permature burial. It's not the recursion effect we're wondering about, but rather the secondary effect. I say if premature (already active before necrovalley was played) is destroyed, the monster still gets destroyed, my friend claims the effect is negated. Can someone clear this up for me?

Any help greatly appreciated.

 

[Manta]

It does not get negated, that part of the effect is seperate from the summoning effect and it doesn't do anything with the graveyard.

 

[Nocturne]

Thanks a lot, I appreciate the info