The below information I didn't find/create, I don't claim the below information withen this post as my own findings, I found this information at:
http://www.TAULTUNLEASHED RULES.com/3783.htmlA little trick called jump shooting, set your keys in interface options to the number pad. then press the "0" when numlock is on to jump.then to spin around in the air click and hold the right button on the mouse spin your char around shoot and spin him back. it will take practice but it is easyer to master. for example 4- Arcane shot 5- Serpent sting 6- Concussive shot 7- Viper Sting. then jump press 7, to drain mana, 6 to slow, and 4 to blast him. spin back keep running. jump again when its all recharges hit 7 6 5 4 in any order, just get a few shots off. normally i can shoot 2 things while in the air.
P.S. Copy/Pasted it from above link.