Dark was...reading a book in Firestorm's mind. He feels Razorwing's presence and checks his wrist like a watch, "A bit quicker than I thought but whatever; they were gonna find me anyway so why try to hide?" Dark mutters to himself as he keeps reading.
Firestorm was still cleaning when he heard footsteps and saw Razorwing pass by but kept working on the 3DM Gear for the time being.
OOC: kinda, it's sort of like the Dark Side in that is causes a chill down the spine when there is a significant increase but the way you described it about covers it.