Justin was about to retort when an explosion assailed his ears, the scout running back to the window to discover that the Harbingers were lobbing spherical shaped objects at the remnants of Connor's men, said objects exploding after a few seconds. Explosives? How on earth could they have created something that compact? 
"Grenades." Connor cursed, striding to the door. 
"You two take potshots from the buildings, see if you can't distract them while I get the rest of the boys and lick our wounds before the cavalry arrives. Hope you can jump far." Walking to the armory, Justin grabbed a rifle with a grainy wooden stock and a strap, slinging it over his back before clambering up the ladder. 
"Cam, here." He helped her up onto the roof and pointed at a ledge waist height. 
"We've got some cover that way. We'll take a few shots from this position, then move to the next roof and keep moving until...well, until we run out of ammo or they're all dead. Here's hoping it's the latter." He crouched, getting the rifle into both hands. Resting it on the ledge, he looked through the scope. 
"Eight of them. Five charging ahead, three standing by the truck. Try to take those out first." He breathed in, shutting his eyes for a brief moment. On the exhale, eyes opened, brow furrowed. His finger caressed the trigger, adjusting the rifle to the left before getting off two shots to one of the Harbinger's legs. He collapsed, the other two unloading their assault rifles onto their position. Justin sank back into cover, reloading the rifle as another explosion rocked the air, screams echoing through the ruins. The hail of bullets stopped, allowing Justin to tell Cam:
"Fire on em! I'll jump over to the next roof and get you covering fire." With that, he jumped to his feet and sprinted to the edge of the roof, his legs propelling him across the gap to the next building. Thankfully the next building had a similar facade, which gave him the benefit of cover, but after taking a quick glance at the other buildings, he realized they wouldn't have cover. They would have to hold out on these two rooftops or get down into the buildings and hope the Harbingers aren't sending more reinforcements up. He got his rifle back into position and spied that the once charging Harbingers were now being thwarted by Connor and a few more of his men. Some of the reinforcements must have been rather close to downtown. He thanked the Graceful Being as he looked to the truck, the driver of the vehicle holding something in his hands..

He then heard what sounded like thunder cracking through the sky, the scout looking to the horizon on their right to find tiny dots coming towards the battle site. As the dots came closer, rotors and extended machine guns were visible from the bellies of the
"Helcopters! Cam, back down, quick!"