Dunno why this would trigger grease.

You focus intensely, and with a great exertion of strength and will create a mighty gust o
f wind with your wings.
Your wingsweep maims someone!
Someone is blinded by some flying dirt and debris!
Your wingsweep mauls a wicked anti-paladin.
A wicked anti-paladin is blinded by some flying dirt and debris!
Despite the grease on you, you manage to hold onto a silver chain flail.