Bioweapon?

A purple mass of pulsating flesh hovered in the air, right above a demonic ritual circle.

Alice watched solemnly as thought about any possible way to eliminate this threat without causing mass casualties. Unfortunately, she doesn't have enough time since it is clear that an explosion will occur and it is in her best interest to get out of there as soon as she could.

Meanwhile, over Blake's side...

He just finished gathering up enough energy. Raising his shield high, he let out a strong yelp before a strong light instantly flooded the whole street.

"Heavenly Fortress!"

Dark Golden light erupted and all of a sudden, all people vanished from the vicinity of the Apartment Complex. The young, old, men and women, even pets included...all of them were transported somewhere else safe.

They'd probably find this a little bit confusing but it doesn't matter. What's important is that they're safe and it better stay that way.