It's the second-most OP Captain buff ever!

[furtim]

From the patch notes:

• Pets should no longer attempt to engage enemies that attacked you while you were mounted but which are now long gone.

ZOMG!!!

(For newbie Captains, the first most OP Captain buff ever was when they let us keep our Herald after mounting/dismounting.)

[Laubgaenger]

This is the 3rd.
The 2nd was, that the Brotherskill still works after mount and dismount.

[furtim]

This is the 3rd.
The 2nd was, that the Brotherskill still works after mount and dismount.

Oh, good point, you got me there.