True that, arty m8
but the following stuff may be of some help too.
Say, ya wanna free the good guys, but ya don't wanna make 'em join ya till you're there & have killed the guard(s)
Then all ya need is a simple trigger, like this:
Let the radius cover the tent/prison building/-area, then hit F2 and drag a grouping line from trigger to YOU (player-hero).
Now, in the "On Activation" field of the trigga, put arty's code, and there... the moron will join ya as soon as you walk into his prison.
later