[JCP-YGO] Krebons negating attack Vs Book Of Moon

[UDEbot]

from UDE's Judge Certification Program (YGO)

Player A Attack Player B face up Krebons

Player B activate Krebons negating attack effect paying 800 LP.

Player A Chains with book of moon to Player B Krebons.

Question: Does Krebons face down negate attack?

http://entertainment.upperdeck.com/COMMUNITY/forums/thread/1542959.aspx