as i sow in this pic
http://www.esforces.com/team/news/1_29_04/gblursm.jpg
when 2 ppl fight this gray aura came around them
so i say y not to do an aura combinaion
like in babidi sega when goku and vegeta fought they aura were combaind to 1 and this will be better then this gray boble
http://www.esforces.com/team/news/1_29_04/gblursm.jpg
when 2 ppl fight this gray aura came around them
so i say y not to do an aura combinaion
like in babidi sega when goku and vegeta fought they aura were combaind to 1 and this will be better then this gray boble