Quote Originally Posted by Ryaz View Post
"Using a weaponskill will cause turret to change targets."

That's the official tooltip description and it's actually poorly worded. If it said it changes to YOUR target, it would be fine. As it is, someone who just got the ability could easily misinterpret it to say it switches to a different target every time a weapon skill is used.
However when you first get your turret, the Machinistry help window appears and tells you it's when you use a weaponskill on a different enemy