When Atlas and his four companions appeared, though their attitudes were arrogant and condescending, they had already formulated a series of battle plans targeting the Vengeful Angels.
Besides killing Reinhardt, their other mission was to seize control of the Avenger Flagship.
A direct confrontation on the bridge would likely cause severe damage to the ship, and they would be unable to answer to Lord Enok.
According to their established tactics, if Chaos God Chaos was thwarted in his attempt to seize control and Atlas couldn't kill Reinhardt quickly, they would immediately execute their backup plan: splitting the battlefield.
At that point, Chaos would step in, teleporting all Vengeful Angels on the bridge capable of resistance off of it. Their own people would be dispatched to engage them; even if they couldn't kill their targets, they had to stall them and prevent their return to the ship.
