Harry promises Lucius to speak under Veritaserum, that Dumbledore confesed to Harry, that he burned Narcisa. Harry is occlumens or almost occlumens, so he can beat Veritaserum, but everybody don’t know it.
Lucius Malfoy has his revenge, and his son, so he let Hermione free. Dumbledore loses, and maybe everything is lost, but Hermione is free. That’s taboo tradeoff.
Harry promises Lucius to speak under Veritaserum, that Dumbledore confesed to Harry, that he burned Narcisa. Harry is occlumens or almost occlumens, so he can beat Veritaserum, but everybody don’t know it.
Lucius Malfoy has his revenge, and his son, so he let Hermione free. Dumbledore loses, and maybe everything is lost, but Hermione is free. That’s taboo tradeoff.
Dumbledore knows Harry is an Occlumens, and he would say as much and have it independently verified.