Khan didn't show any hesitation in seizing the bone cup, but that feeling invaded him when his eyes returned to the cauldron. He had understood what the old Scalqa wanted from him, and his senses worked overtime to find ways out of that pickle.
The old Scalqa wanted Khan to drink the dark green liquid, but his senses had already warned him. His body instinctively disliked the substance, probably hinting at toxicity, poison, or other ingredients he would reject due to his unique situation.
Moreover, the longer the inspection lasted, the more convinced Khan grew. Even standing before the cauldron was attempting to make him light-headed. The dark green liquid's fumes were enough to affect his condition.
Even worse, the Scalqa seemed to respect the old alien and the cauldron. The crowd had gone silent ever since the cauldron had come out. The tribe clearly valued the event, making escaping it rather complicated.