Aftershock Always hit the chest piece?

KainShadow

KainShadow

Frost Gate Guardian

Join Date: Mar 2005

Legacy of Abyss

E/

..doesn't seems O_O

Aftershock - spell
"Nearby enemies are struck for 26-85 damage. Knocked down characters are struck for 10-56 additional damage."

Today i bought the geomancer 15k chest piece and I tried it vs a Sand Drake, he usually hit me for 105 with aftershock at 60 AL (the first hit, not bonus dmg "if the target is knocked down")...
Well, i equiped my new chest piece along with my other "basic" pyromancer pieces (so in total: Head: 60 AL - Chest:60 AL +15 Vs Earth attacks - Legs, Hands, Feet: 60 AL +15 vs fire attacks ) and, surprise, the first aftershock hitted me for 105 , the second hitted me for 81 (which is right, 60+15 = 75 AL, 77,1% reduction dmg , so 80,995 dmg) and the third again 105...so what's the problem?
Why only the second attack hitted my chest?
Aftershock isn't a Direct Damage Spell ("Nearby enemies are struck for ..." ) ?