Maintain a Safe Distance

The vet said that the the rangers have to  get out of the area surrounding the lion otherwise there was high chances that he would attack the ranger or the rangers. He asked the other rangers to do something that would quieten the lion, there was another thing that they could try and that is sedation.

This would pacify the lion and help find out what could be affecting the lion. In fact it was the only way, there were no other safe ways to find out how to pacify the lion and find out what was affecting him?