There was some delay in the response from the enemy. They waited behind cover on the far side of the room, only giving token return fire as they waited for their attackers to take the space they had given up. However, Aviza did not give the order to advance, and the delay would give some time to try and retreat back to her position. 

When it became clear that their attackers had, for the most part, not taken the bait, the Chieftain let out a roar. Right away, Brute stalkers, four at least, emerged from active camouflage on the walkway directly above the team’s position. They did not have an angle to shoot down on Aviza or those who stayed back, but Tar and Yalu were within their sights. Two opened fire with spikers, while the other two tried to throw incendiary grenades to block their retreat. It was, indeed, an ambush, though it was far from ideal for the Brutes, as both of the Sangheili were still fairly close to Aviza’s position. In any case, the Chieftain’s roar had been the signal for an all-in attack. The Brutes started charging from far across the room through the crates, while the Human rebels positioned themselves to provide supporting fire. Although, they did have a fair amount of ground to cover to cross the entire length of the room.