Instructions
Move your onscreen cursor over the area that you want to hit with the MAC Blast.
Press the "Up" button on the Xbox 360 controller's D-Pad to open the "Spirit of Fire" menu.
Press the "Up" button on the D-Pad a second time to highlight the "MAC Blast" option.
Press the "A" button to select the attack. The MAC Blast will now be fired at the selected location.