Fremy-signals he knows

Fremy handed him two small firecrackers. They were the signal firecrackers that  he had used within the Illusion Fog Barrier. If he were to break one of them Fremy  would instantly know his location.

   "I've inscribed numbers onto them. Number one signals a request to be saved. If  you smash that one then we will lower the barrier immediately and head off to  help you. Number two is for contact. Break that one after you have found  something."