I've been using a water stop bath for years. With fiber base paper I go from developer into a water bath because fiber paper is intended to develop to completion, not instantly. I let the print set in still water for 1 minute and then spill it out and begin a running water rinse of agitation in running water for another minute, then into TF-4 for another minute. I've not had a problem and feel the additional development time in still water renders the highlights nicely.