There's a dead person following him.
Which, in and of itself is an odd thing, were Jason not so used to it at this point. He knows his dip in the Pit did some weird things to him, left him as something not quite dead, not quite alive.
Something else, he supposes, is the best way to put it, no matter how often he sees Bruce's jaw tighten when he tries to talk about it. He died, plain and simple -- and then was brought back. It makes sense that things wouldn't be quite right.
The first couple times he saw the dead, it did freak him out. People there and gone between one blink and another, and attempts to point them out met with looks of confusion and concern. Like he needs help.
Now, he ignores them. There's an older lady at his favorite bodega, a handful of faces he sees when he passes the cemetery. It's just part of it.
This, however, is the first time he's been followed. He tries to shake them, but it's hard to lose someone who can, y'know, pass through solid objects.
He lasts another ten minutes before he turns around and finally confronts them. "What do you want?"