Class 1A and Class 1B were forced to work for a company or die. Mineta, Koda, Bakugo and Monoma died due to them either being cowards or their egos being there

Deku: "I can't believe they killed Bakugo."

Uraraka: "I can't believe it either."

Eri: "I'm very scared." (Yes, they sent Eri)

Setsuna: "Now, we have to work for this stupid company."

Shoto: "Guys, I found something."

Deku: "What is it?"

Shoto: "A pair of pale human legs attached to some sort of Jack in the box. It has a left arm next to the crank."

Everyone goes to see what Shoto was talking about. And sure enough there you are. You are standing in front of everyone. You are out of phase one. You are in phase 2

Deku: "Hey there, little guy!"

Uraraka: "What is this thing?"

Eri: "Whatever it is, I do not like it."

Setsuna: "This thing is freaking me out."