"Seems to have a bit of an fixation," Batman commented "There's definitely a theme." Fear. The toxin, the Halloween-inspired gimmicks, even the old crimes in Crane's past - a scarecrow with a shotgun, and in a field, and then an ignored old woman with a coronary who had either suffered in fear as her cries help went unanswered - or died of fright itself.
All of it was completely circumstantial, but taken together, it was enough for Batman to finally have a target to focus on.
Seeing her concern for the bike, Batman nodded his head toward the street. "I own an abandoned building a block away from here I use when I need a place to lie low. It's made to look occupied so no one questions. There's an underground garage. I can give you the code if you'd like to use it." Reciting the five digit pin, he opened the Batmobile, the doors opening like a flower's petals, the roof lifting up and pulling the seats with it.
Climbing in, he gave her the address, then said, "Follow me," and with only a flicker of light to signify that the car was on, the car silently pulled out of the alley onto the streets, waiting only until she was ready to follow.