Without your ally staying close and keeping distance you don't have any chance against Zhin. He can counter your Beam just with Whirl and counter you Wings of Wrath just with Billow. Zhin is danger from short distance so just be sure he is far away.

Imani can be easily stunned when she activate inferno canon and damage she deals from Frost Bolts and Pyre balls is very similar to damage Io deals from Light Bow. With one second out of combat Imani have no chances with Io and Luna together.