Board Thread:General Discussion/@comment-25353135-20141009184954/@comment-25413835-20141010205621

Gauthamben10 wrote: you can go this page and read the last two paragraphs http://ben10.wikia.com/wiki/Vilgax_Must_Croak

Thats just some explination some wiki editor put on the page. Thats not the official reason, and that still doesn't explain why he shouted "NOOOO!!!" as he jumped. Personally, I think that he did it to save the omnitrix. Thats the most logical answer.