Waboku explainination: it makes any Battle Damage done by an OPPONENT'S monster to 0. Therefore, the attack would just stop your monsters from being destroyed. Errr let me make an easier scenario...
Player A has an Archfiend Soldier (1900 atk) and Player B has a Gemini Elf (also 1900 atk) and a previously set Waboku.
Player A attacks with Archfiend Soldier for a kamikaze with Gemini Elf. Player B activates Waboku, stopping all Battle Damage done by Archfiend Soldier, however, Gemini Elf lives and Archfiend Soldier still dies, get it?
For other situations, NetRep has a whole article on Waboku somewhere