got an unranked lux supp in my silver game

Might not be that big of deal but our Lux legit didnt know what being a supp meant. Didnt know what to build how to be a supp. When told what to do she was clueless. When told to stunn peope whe was "stunn who?" and wasn't attacking turrents. Last thing i knew is that the additon of Iron was to better seperate players to a rank more fit their skill and not dump them in silver after placements. So how did this happen?
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