I concur, with reactors (especially object reactors) make sure your code runs without ANY problems. The multiple attachments you've come across is probably one of the more benign that you might run into. Some may even crash acad, or (pray this never happens) loss of data. So before starting to use these things (even if you're the most experienced lisper on the planet) I'd advise to test and test and test ... and then test some more ... and just to be on the safe side test again ... and then again.
These things tend to have a mind of their own if you don't look out (or at least they appear to), it's a situation of "With great power comes great resposibility" ... it's just that in this case it reads more like: "Great capability seeds propensity for error".