'gook , ' observed the librarian , contriving to imply that rincewind was in a region where even things like time and space were a bit iffy , and that it was probably not very useful to speculate as to his exact state at this point in time , if indeed he was at any point in time at all , and that , all in all , he might even turn up tomorrow or , for that matter , yesterday , and finally that if there was any chance at all of surviving then rincewind almost certainly would .