how does the moderator decide that there was a reference made to a grand stand error to a show off. how do they say wait a minute, that's for drurp to respond so? there's going to be some real calls tonight as to who gets that 30-second rebuttal. they're not going to say donald trump's a clown. they're going to stay too much clownishness. that's where it's going to be really tricky in the control room. >> yeah, let's talked about reaction shots. certain reaction shots have tanked people in the past. how do you think that's all going to play out as they're punching the shots for this tonight and everybody's paying close attention to the smallest of calculations for each candidate? >> reporter: trump is a natural on television and he is spontaneous.