Sentence:  ...So we cried to him, "O Rais, what is the matter?"; and he replied saying, "Seek ye deliverance of the Most High from the strait into which we have fallen and <WSD>bemoan</WSD> yourselves and take leave of one another; for know that the wind hath gotten the mastery of us and hath driven us into the uttermost of the seas of the world." 
Meaning of the word marked with <WSD> tags:  To be dismayed or worried about (someone), particularly because of their situation or what has happened to them.