The OP said "Suggests that the only way the goblin will survive is if he throws the sword back".The suggestion was to throw the sword back or you will die - I don't think that rises to a "You must throw the sword back or you will die". Therefore my take is that as long as the sword gets thrown back by someone the suggestion is completed.
Was that changed in a later post to be lacking the "he" part and replace it with "somebody"?