They were walking through Green Hill all destroyed the animals dead on the ground and some were injured

Shadow: "Agh...this place smells horrible...!"

Amy: "The sky here is red...it's a little scary..."

Tails: "poor animals...."

Knuckles: "Here... there's no color anymore..."

Silver: "Here... there is a very strong smell of blood.."

Cream: "I feel watched..."

They say it while walking over Green Hill Zone