Demon Lord Hunting

Lucien stared at the leaving ambulance with the five players. The bald officer in charge give instructions to the new comers. 

Lucien did not notice when they came, but five to ten people in black suit appeared and gathered around where the gate used to stand. They brought hand equipments and other beeping tools. Lucien squinted at those monitoring lights. 

He haven't seen those monitoring hand held equipments before. But as he focuses on looking, he noticed the beeping lights will flare up whenever there's an abnormal concentration of demonic energy.

What's even more weird, is when they press that red button, the demonic energy concentration will dissipate. As if it was absorbed internally by those weapons.