After killing only one zombie, those that hadn't killed any zombies yet looked very pale, and some even went to vomit.
It was obvious that they couldn't really stomach killing zombies at first, even though they knew that they had to kill them in order to survive.
They also had seen others kill a lot of zombies, but when it was already their turn to kill zombies, they were still very pale and were afraid.
"Now that all the researchers are done, let's have Nina, and then Ava would be the last," Treyton said.
Nina didn't say anything and went downstairs with also a spear.
Luciel had already seen Nina asking for tips on how to kill zombies efficiently and what weapon would be good for her from the others when Treyton said that all those who hadn't killed a zombie needed to kill one.
Luciel also saw Nina trying out the spear earlier, so it could be said that she had prepared a bit within the short time that was given by Treyton.