If you have a recording of the game, you can see the incident reviewed during the 4th Qtr with 17:50 left on the clock.
As Hawks were celebrating their goal after the 3 qtr siren, Duryea was jogging to the Hawks huddle that was celebrating, Walters took the opportunity to stick the right arm out, (appears to be more open hand than a fist) and collect Duryea on the forehead. Duck commentary "a clip behind the ear, might be a fine, but not too much in it".
Hawthorn's medical report will probably include the severe neck soreness caused to Duryea from the delayed "involuntary" reflex which caused his head to suddenly and violently throw backwards a full step or two after the contact.
It wasn't anywhere near as bad as when (R18) Hodge hit the Richmond player in the jaw with his right fist, so given Hodge didn't get reviewed by the MRP for that incident I expect Walters, the dirty Fremantle scumbag to get a week.
