With the sudden arrival and outbreak of hundreds of violent and powerful beasts, the defenses set up in the Government District were slow to come online.
Part of it was because too little time had passed for the colonial government to complete the defensive arrangements.
Structural energy shields, turrets and physical walls were in short supply. The ones that did exist only held out for a short amount of time before the larger transphasic warbeasts broke through them by force, which was exactly what they were designed to do by their creators!
"Damnit, who created these beasts! Why are they so powerful and how much phasewater did those scientists pump into their bodies?!"
The defenses broke too easily, showing that the quality and the cost of the largest artificial creatures were exceedingly high!