He could tell that the mist was<em>trying</em>to affect him; likely a poison effect, of some sort, but it didn't actually do anything. The robot remained still, and when it noted that the mist didn't seem to have any effect, it backup up, and began to scan him with the different color eyes again, going through the loop several times, but not seeming to come to any conclusion, before skittering off to a corner of the room, and apparently powering down.