Panic Attack

Intro
This starts with Batman after you talk to Sergent Doak.

Batman: This is Batman. I understand you just destroyed a Brainiac Harvestor Ship. Impressive. Let's see if you can handle hero work on the ground. The Scarecrow has escaped from Arkam Asylum and is filling the East End with fear gas. Ready to face you nightmares?

Objective

 * Travel to abandoned construction site in East End.
 * Collect fear gas activators x25
 * Defeat Screamers x15

Walkthrough
Follow the yellow arrow on your mini-map to the abandoned construction site in the East End of Gotham City.

Then listen to Batman's new message.

Batman: Welcome to a typical night in Gotham. Scarecrow's gang has overrun the East End, pumping fear gas into the atmosphere. They're using an abandoned construction site to distribute fear gas foggers to the rest of Gotham. Shut them down before they panic the entire city.

Then look for the Screamers. They are wearing yellow jackets. Take them out and collect the fear gas activators.

Result
Reward: Cyber-Enhanced Gauntlets