Because Lestrade will always protect him.
The Protector
Give me your pain; I will take it.
Give me your misery; I will welcome it.
I will wear your suffering upon my back;
And I will take your burden around my neck;
And my arms will hold you and make you safe.
Give me your sorrow; I will endure it.
Give me your fear; I will carry it.
Slings and arrows shall pierce my skin;
And I will bleed in your name;
And I will shield you and keep you safe.
Give me your darkness; I will brave it.
Give me your hardship; I will suffer it.
I will bear your aloft in my arms;
And you will not fall;
And I will love you and you will be safe.