Aftershock is bugged or the tooltip is wrong.

Just lost to a Riven running aftershock. I was SHOCKED (HAHAHAHA) to see my Vlad empowered Q deal only 59 damage to her far after her aftershock exploded. I went back in to the replay to see why. I timed her bonus stats at lasting 3.5 whole seconds. (14.11s was my best effort at recording it at .25x speed.) Let me copy+paste the aftershock tooltip for y'all.

PASSIVE: Stun icon Immobilizing an enemy champion grants 70 − 120 (based on level) bonus armor and bonus magic resistance for 2.5 seconds. After the duration, you release a shockwave that deals 10 − 120 (based on level) (+ 3% of your maximum health) (+ 15% bonus AD) (+ 10% AP) magic damage to nearby enemy champions and monsters.

This is BLATANTLY wrong. Im going to report this to the bug section as well. Upvote for visibilty, run this rune while it's still broken.