User blog comment:B214/Question & Answers 5/@comment-82.199.209.161-20160302154156/@comment-1359322-20160302155309

Actually it seems to work so long as there's no direct contact, so it might be because Vali's Lucifer blood can't take in the aura of a God since they'll harm him.

"“……I won’t be able to activate the power to halve if my opponent is a God-class. So I will have myself reduce your power slowly!”

DON! DON! DOOOOOOON!

Vali created many attacks made from his demonic-power which are mixed with the Norse-magic formula, and he shoots them out. Each of them gets taken down by Loki’s magical power, but not all of them could be wiped out, so several of them hit Loki’s body. But, he didn’t receive any remarkable damage.

“To be expected from the Hakuryuukou! It seems like you learned the Norse-magic in such a short time, but….-It’s still not enough!”

Loki releases a wave of magical-power which is glowing in a rainbow colour. Vali makes his wings bigger, and it seems like he is planning to take it head on.

[DivideDivideDivideDivideDivideDivideDivideDivide!!]

The Divine-Dividing’s ability was activated, and Loki’s attack continues to get smaller."