I noticed when Aerie returns it interrupts your attack command for a moment, it may not seem like a big deal, however that trips up high attack speed and can cause 1 (Maybe even two since my character only had 1.5-1.75 AS at the time I noticed it) attack to not be performed.
It can also cause missing of CS.
Post your PBE bug reports here: something not functioning as intended? Store is broken? A champion's ability is not working? etc
Need help? Read our [bug reporting guide](http://community.pbe.leagueoflegends.com/c/bugs/CF5EEDC8FF5AC1A896F517E2C7AE4650C472807F-how-to-report-bugs-on-the-pbe).
Comments about things you don't like or suggestions for improvements go in Feature Feedback.