The dominant visitors continued to press for an opening goal and Stack had to look smart to put Mehdi Taouil's shot out for a corner following confusion in the Hibs defence as Dickoh blasted his clearance off Ian Murray into the path of the Moroccan.
The aerial prowess of the Rangers attack was troubling the Hibs defence and Boyd nodded into the path of Kenny Miller, who headed just wide of Stack's goal.
The game had died down, but then Agard picked up the ball after running back from what looked, certainly to the Hibs fans, an offside position and bore down on Stack's goal.