can be any number of reasons... there are classes that can see/track steallthed/invis players and tinkerers can make items that allow you to see these people as well. at level 20 there are totems useable as well as spell abilities depending on the class. best bet is simply sprint out the combat penalties and hope you train them to friends. not sure what brigs get but when you go into stealth dont you get see stealth or inviis?????
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