But wait, the Zerglings aren't done yet. They cocoon themselves and mutate into a new form - a suicidal bomber filled with acid. One of the two Colossus's go down immediately, and the other just barely makes it to safety by climbing up a ledge.
Unfortunately for it, a swarm of flying Zerg Mutalisks arrives and delivers the finishing blow. Their victory is short-lived, however. A squadron of Protoss Phoenix air superiority fighters arrives and decimates them using an ability called overload, which damages all air units in the area but temporarily paralyzes the Phoenix.
Familiar Terran Battlecruisers show up and blast the Phoenix fighters out of the sky with their Yammato guns, and in turn are attacked by Protoss Warp Rings. The Warp Rings are Protoss air units that fire an energy beam that becomes more powerful the longer it is engaged, making it a devastating weapon against larger targets like Battlecruisers and structures. Their weakness is smaller swarming units like Marines - a squad of them brought down the Warp Rings with only a few casualties. As the Warp Ring debris fall, they land on a slope and bounce and roll down, showing off the game's physics system.
