Malek had pondered on Tanya's words to him.
He was completely sure Celeste was just jealous of Tanya, and that's why she targeted her, but Tanya insinuated that he was jumping to conclusions without properly investigating.
"She attacked me because of you!" he recalled Tanya's words to him. He then let out a frustrated sigh as he looked
Despite how he felt he decided to listen to Tanya he wanted to do this for her sake. Though he doubted he would find anything that would proof Celeste did this on her own. Despite how Tanya felt Celeste was going to be punished regardless. She had to be after almost killing her.
He had to find out how Celeste obtained the poisons in the first place. That was the major work he had to do.