bboxz - specify the entity's z-depth that can be hit. Each bbox can have one. default to 0.
You can also set this value at the end of bbox command.
attackz or hitz - specify the entity's attack depth. Each attack box can have one. default to 0, then grabdistance/3 will be used.
You can also set this value at the end of the attack box command(after hit pause).
