Twilight takes a break from her royal duties to help Rainbow Dash and Brownie be friends again.
And on top of that, thanks to her actions they became a couple.
With some help from Spike, Brownie manages to reunite what's left of the Mane Six after Twilight turned into an alicorn and moved to Canterlot so she could learn to be a Princess.
His deduction skills should probably count, too. He noticed that something was wrong with Spike just by pointing out that the only books out of the shelves were placed at the bottom (where Spike could easily reach) and how the piles of books were ordered alphabetically because of so many years working with Twilight.
The Comic Book Miniseries.
The fight against the Veratu's monsters in the first issue.
