User blog comment:Herzinth/Eena, the Mad Mirror/@comment-1330314-20150216211552/@comment-24873836-20150216214001

Yeah, Eena's E and R have given the most trouble by far since I first posted her on the old LoL forums over a year ago. Currently, the idea behind them is a kind of disengage combo. Scenario: Teamfight has gone poorly, you and your teammates are on the run. Pop Forced Reflection, with the clone continuing to run. When the enemy gets to your position, pop ult to punish them for chasing. The passive then helps make sure they can't just erase your squishy self in 0.1 seconds and keep on going.

But definitely, I'm still brainstorming alternative ideas for those two abilities.