The best thing i found to do is keep spaming your auto attack. Think about if you went stealth wich way would you try to escape. They arnt going to run at you there is usally only 2 ways out of areas so just chase, and keep shooting you will still hit them. Once you get good at it, its awesome seeing one come out of stealth in the downed position. The only thing i hate is when your trying to finish them off and they stealth or what ever they do. Then seems like sometimes they port really hard class to finish off if they know what they are doing. But anyways thats a diff subject just keep shootin throw traps if ya want too.