The only way to beat the giant Beta is via direct attack to the brain, forcing Ogre into a very perilous situation. Auctioneer risks his life to locate the brain, and Ogre uses Number 11 to take it out and defeat Beta.

He reunites with the Squad and celebrates, but his joy would be short-lived.
Okay. Use Number 9 to turn me 
into a bomb as planned.
حسناً، استعمل رقم 9 لتحويلي لقنبلة كما خطّطنا
Gut, dann mach mich nun, dem Plan entsprechend,
mit Number 9 zu einer Bombe.
Sigamos el plan.
Sigamos el plan.
Suis le plan, à présent.
Allora, come da strategia,
Certo. Use o Número 9 para me
tornar uma bomba como planejado.
А теперь используй номер 9,
чтобы превратить меня в бомбу.