Rageblade/Botrk double auto attack

Its more a question, than a bug report, but is it intended that a full stacked rageblade procs a full second auto attack when u have a botrk? I mean shouldn't just the 8% bonus dmg occur a second time? I tested a lot with varus and ezreal in the practice mode and I was kinda confused, because I hit for over 1,2k with a single ezreal Auto (full item-build). PS: shouldn't ezreal Q hits stack the rageblade too? Sorry for my bad english, its not my native language.
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