That's part of their Russian Training.. I remember that from a couple seasons ago. You find something else to distract your mind so you don't become attached to the Subject.
Elizabeth tried to do the same thing by looking at dudes Shoes, but I guess dude was packing more then what she expected. It will be interesting to see if she still interacts with dude now that they know he is not involved.
I also loved that Elizabeth immediately called Phillip to tell him she missed him after she fucked the mark, because she felt guilty that she enjoyed it.
The Season 1 and Season 2 Elizabeth wouldn't have given 2 shits...
She also wouldn't have told Phillip that she would take on the kills because she knows it is getting hard on Him.
Old Elizabeth would have told him to man the fuck up.
Honestly this is the first time... that I could see Elizabeth being willing to give this entire thing up for him.,