Trapped again

Back in this lonely cell.
He awaits his death.
An inevitable end.
The final solution.
Certain of his death.
He watches the birds.
Flying far and free.
While he is trapped.
He got his revenge.
The bloody satisfaction.
Now it is almost time.
To pay the price.
Give his blood for the others.
Pay back what he has took.
But soon that door will open.
And he will face the end