Forum:Stardust Assault Mode Vs Honest

Question can Stardust Assault Mode negate honest in the damage step, Let's say you attack SDAM and play Honest to increase your monster attack can i activate SDAM effect to negate honest effect. one of my friend say that's it can't activate it because it's in the damage step and cards cannot leave the flied while in damage step, he also says that it will cause a replay, Please help need to find out if they are cheating my Stardust Assault Mode. Shinobix3000