@Dabhand
Yes it is a fine line, but if people dont specifically say they 'downloaded' something then they are within the rules.
Technically he could have seen the files anyway, at a friends house, at school or work etc.
So until they are silly enough to dob themselves in we really have to give them them the benifit of doubt and take their questions as being legit, even if we feel they may have infact downloaded it.