i think the slash means or, so it takes 20 minions or 17 lieuts etc.. cuz it certainly doesnt make sense if it's 'add' unless all attacks are ranged. i assume this just mean the hero just stand there and take the beatings until he gets knocked out i dont think you can make any attacks based on these end heavy builds.
actually can we see some demos? that way we dont have to ask about fighting conditions/strategies/enemy actions/formations etc.