Forum:Defense Draw Questions

If I attack my opponent directly because he/she has no monsters on the field, can they activate defense draw? More so, does it drop the damage to 0 even if I attacked directly? I guess my real question would be what exactly constitutes damage calculation and battle damage?

Also, if I attack a monster, and my opponent activates defense draw, do they receive 0 battle damage for the entire turn or just from that one monster battle?

Thanks in advance. ````