Why does this question trip me up?

http://classic.7sage.com/lsat_explanations/lsat-57-section-3-question-14/

I go so caught up in the relatively or seemingly complex diagramming that I overlooked the question stem I read initially (violates) and screwed it up.

I find myself doing that once in a while - I read the Q Stem first, then go to the stimulus, get caught up in that, then screw it up because I lose sight of the the Question Stem....

Is it just a matter of quickly re-reading the stem - since I have to focus on applying info from the Stimulus it anyway?

BTW - what's the question type for this Question "violates the rule..."

Thanks in advance!