[Ciel isn't remotely a target, having been deemed weak and vulnerable by the monsters during the first wave of attack which, thank Queen and country, means that it's actually okay for once that Sebastian's not around to protect him.
Instead of cowering somewhere in fear, he's fortified himself behind some physical barriers, taking pot shots at any creatures running by, especially if it's chasing someone. And if it's chasing you? He'll send a perfectly aligned shot just over your shoulder to slam into the monster's head.]