(Harmonia Nectere Passus)

We both know that Lord Voldemort has ordered the Malfoy boy to murder me

But should he fail, I should presume the Dark Lord will turn to you

You must be the one to kill me Severus

It is the only way

Only then will the Dark Lord trust you completely

(Avada Kedavra)

There will come a time when Harry Potter

must be told something

But you must wait until Voldemort is at his most vulnerable

Must be told what?

On the night Lord Voldemort went to Godric's Hollow, to kill Harry

and Lily Potter cast herself between them

the curse rebounded

(Lily Screaming)

When that happened, a part of Voldemort's soul

latched itself to the only living thing it could find

Harry himself

There's a reason Harry can speak with snakes

There's a reason he can look into Lord Voldemort's mind

A part of Voldemort lives inside him

So, when the time comes, the boy must die?

Yes

Yes

He must die

You've kept him alive so that he can die at the proper moment

You've been raising him like a pig for slaughter

Don't tell me now, that you have grown to care for the boy?

(Expecto Patronum)

Lily

After all this time?

Always

So, when the time comes

the boy must die?

Yes, he must die

and Voldemort himself must do it

That is essential