Optimizing the Slow
Optimizing the Map Pressure
What to do: Laning Phase
Poke the **** out of the opposing AdC with your Q, which will also give you ****loads of money every time you do so. Place Barrels in the bushes to surprise your ennemies with Combos, that you can set up quite freely, since the ennemy has to focus on farm, ganks and your AdC. Always keep an eye out for opportunities to Ult and generate free assists and don't just save it for your own fights.
What to do: Late Game
Slow and chase down people with your Q and E, generate Map Pressure with your Ult and Redemption and speed up your allies with Reighteous Glory and Raise Morale. That's basically the point of that build. You won't do much damage, you won't get much gold with your Q, but you'll be a huge assisstance for your team buy just providing massive ultility. And last but certainly not least you'll need to create a decent Playlist with good old pirate music before the game, to properly scourge your ennemies while feeling like a true pirate.