Spy Missions: you have a massive amount of energy to complete without having to stop and drop a pie.

Focus Farming: the duration on your sleep arrow gives you plenty of time to get your stealth kills.

[Stretch] is only on there to make the beginning Bubble Radius bigger. You will only need this in some missions where the starting area is subject to being seen right away.

With the two different types of Arcanes, (Not necessary), you can get very high focus points while farming focus.