What happens with the image tokens if the conjurer is defeated/knocked out?
Nothing. Although since the Conjuror himself is not able to use any abilities other than the Stand Up action while KO'd, the images won't be doing much of anything until the Conjuror is revived.
As Zaltyre pointed out, there's also not much point in the OL attacking them since the Conjuror can't take any additional damage while KO'd as he's already maxed out. This could turn into a particularly cruel way to "kick 'em back down" as soon as the Conjuror stands up though - nix an image from around the corner before he can do anything... >=)
Regarding the Rules for "something treated like a hero" where exactly do I find this section? Do you mean the "Familiars treated as figures" Section in the D2E rule book?
In the rulebooks themselves, the properties of "being treated as a hero" are only described in the context of familiars (in the core book) and allies (in LoR.) However, when people started asking FFG exactly what "treated as a hero" meant for NPC tokens and other non-familiar, non-allies, the answer was as given above, and has been consistently so ever since, as far as I know.
As somebody else said, the rules are there, they just aren't spelled out very clearly. FFG has been known to have this sort of problem with their rulebooks.
Edited by Steve-O, 16 June 2014 - 06:05 PM.