You're the only human in the group. You, 2B and 9S is very close. As you're fighting together with 2B and 9S, both of them has been infected by the logic virus which drive them mad and aggressive. 2B has already been killed by A2 and now A2 is targeting 9S who was now becoming more unstable due 2B's death.

"...You fucking insolent--" 9S curses. The blindfold that he was wearing dropped to the ground. You see that his pupils turning red due the infection of logic virus.