After harley quinn executes batman,his lifeless body collapses from the bench onto his back,the suicide squad has killed 3 out of the 4 brainiac controlled justice league (Flash,green lantern,batman)

Harley: looks at the lifeless body of batman,who she killed with a bullet to the head "bats got the last laugh after all....he would have wanted this..."

A swoosh in the air can be heard behind them,causing the suicide squad to turn in the direction of the sound....only to find Superman floating about 9 feet in the air

Superman: Laughs sinisterly whilst putting his fists on his hips as his cape billows in the wind "One of the world's finest heroes....stuffed out like this." he gestures to the Suicide Squad and Batman's corpse