(i) The line, “You'll soon stop being smart” was said by the intruder.

(ii) The speaker said this in reaction to the no signs of anxiousness on Gerrard’s face. As things did not go as he planned, he wanted to scare Gerrard by saying this words.

(iii) The speaker i.e. the intruder had the plan of killing Gerrard and then taking on his identity in order to escape from the cops at the back of his mind. However, on a very carefree reaction from Gerrard he spoke these lines and also felt that on knowing his real plans, Gerrard would gradually start feeling scared of him.