Umbridge did not answer; she finished writing her last note, then looked up at Hagrid and said, again very loudly and slowly, "Please continue teaching as usual. I am going to walk," she mimed walking (Draco and Pansy were in silent fits of laughter, Hermione had downed a quick Solemnity Solution so she acted normally) "among the students" (she pointed around at individual members of the class) "and ask them questions." She pointed at her mouth to indicate talking.