HARRY
Voldemort is going to kill my mum and dad, and there’s nothing I can do to stop him.

DRACO
That’s not true.

SCORPIUS
Dad, now is not the time...

ALBUS
There is something you could do – to stop him. But you won’t.

DRACO
That’s heroic.

Harry Potter and the Cursed Child - Chapter 4 :
See this quote in the Pensive -