Aiolia Level 45 Quest

First of all, I'm sorry if I'm repeating this topic, but I couldn't find any answers about my problem in other topics :(

I got a quest at level 45... One which Marin gives you something to deliver to Aiolia, in Rozan, near Master Roshi (actually, across the river in front of his place...), and I got no problems until facing Aiolia. I try to defeat him, but I can't do no more damage to him after he reachs 10HP. A friend ingame told me to use my Pegasus Ryu Sei Ken to finish him, but I did that and got nothing :(

Any help?

Thank you all!

LAZY !!!!!!!!!!!!!!!!!!!!!!!!!!!
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Use this move on him