Watch out for his ability to leave behind an explosive fissure, and stay away from it! This would result in him getting healed and you taking severe damage. Make sure to track him too, so as soon as he is physical you can attack and kill him.
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.
Evie is fast enough to escape from your beam and your wings of wrath. To counter her be sure she has no more blinks and soars and when it happened use your beam. You should keep just a little distance as long as you don't play on Exterminate.
If you are in a area with good cover you can flank him with rocket boots. A few close shots send him into critical. This is especially useful If he has attacked some one else with plant.