Bird knows he's going to die.
It's no longer a matter of if, it's a matter of when.
He's biding what time he has left.
He can't go back to HQ. He can't tell anyone. That's how they find out that he's onto them. That's how they die quicker. That's how they make him let his guard down. That's how he gets a knife wound into the back.
He has no one to rely on but himself, and no way to defend himself but always thinking about what would happen if he didn't.
He can't sleep at night, even if he wanted to. The only thoughts that cross his mind when he considers it is how he wouldn't wake up.
He feels eyes on him, all the time. All the blinds are closed, every door is locked three times over. So it can't be an outside force doing this to him. It means that they're inside the house. They're inside the house and know where he his all the time and is only just waiting for him to let his guard down for one second.
But they know that he won't, they figured it out a while ago. He feels the anger in the eyes, the anger each time that he bests them, each time he walks into the room with a flame already in hand.
They want it to be easy, they want his death to be effortless for them, and that's why they're waiting. And that's why they grow angrier each day that he bests them, each day that he evades death and each night where he keeps tabs on every entrance.
Every way for somebody to get in, no ways for him to get out. Getting out means death. They have people waiting outside, for the day that he tries to leave. He knows, even if he hasn't seen out the windows in days.
He can feel it, he can feel how they wait.
He can't wait longer then them. He's on borrowed time, really. But he can get close, he can get as close as possible.
On the night that they out last him. Whenever that may be, he hopes that the city's heroes are called onto the scene.
They're owed an explanation, and a better medic.