People weren't taking it seriously.
Some of them run, sure. But most of them just stop and cheer as soon as a hero comes to their rescue, not even worrying about the fact that they were making the jobs of the heroes even more difficult by them staying there.
Of course, some of the heroes do not mind especially those who were new or those who were stuck in Grade C and below. After all, this was their time to shine and fight off some giant blue aliens.
The aliens were classified as Threat Level 3-4 by the Government individually, something that they could deal with no problem if they gank or work together. And since their opponents were aliens, the Government ordered a kill-on-sight policy, making their jobs even easier.
The humans were winning and it hasn't even been a day.
But then, something from the skies landed.
Enough to block out the sun a machine; a robot the size of a skyscraper.
The heroes that were once rejoicing had their smiles slowly fading as they all looked up to witness this colossal manifestation. It landed right in the middle of the city.
...