At some point, Carter 'finds out' that Aziz is getting annoying and better be temporary unconscious. To do so, Carter would have to manipulate Aziz's mood or do worse things.
Even though he is Carter's roommate and best friend on Marsi-3, Aziz gets in the way and sometimes annoyingly frustrating.
You can knock Aziz down in two different ways, get him detained or high. Either way he would end up in sickbay unable to move, talk or even gesture anything to Dr. Chantal.