How Hero's defense bonus work?
This bonus applies to All units from same account that are standing with hero in one village.
If a player send troops + hero from one village to a target and send more troops from another village to same target, as long as they are with each other this bonus will boost all of them. Any other troop outside this target village gets no bonus.
In this image, All units from Kitty have full defense bonus from their Hero, Because they are all in one village with hero, no need to come from one village.
Next post, I will post proofs and battle reports from fixed and controlled environment.