Yes indeed,because that was the last time he saw those two little boys alive when Sheila came unsuspectingly towards him in the fields bringing his nephews,little knowing that within a matter of hours her brother would shoot them coldly and deliberately through the head..
Looking at it from another aspect would be that Sheila was " doing the rounds ",knowing what would befall everyone,,so she was giving the boys a lasting glance of their uncle,his tractor,and the fields before they settled for their Last Supper.