To lock down a kill use your R and Flash towards your target while in the air. E to root them, then W and AA.
To root an unsuspecting enemy use Q AA and E, then quickly activate Galeforce while the feathers are flying through the air.
You can use your ult for damage by casting R then E W. AA three times, then Q and AA.
Kill a low mobility target quickly. Use W Q and then Flash mid animation, then AA and R. When you land AA E and AA.
For a fast root quickly Q AA and E.
Your standard trade is to W then AA Q AA, followed by E to root.
Catch enemies out by using R E, then Flashing to root your targets.