Can Astral Combat be used against mundanes?, Attacking their aura? Options

[vollmond]

SR4, pg 184

Astral combat is resolved in the same way as physical com-
bat. Astrally perceiving and dual natured characters use their
Physical attributes and skills to fight opponents with a physical
body, and their Willpower + Astral Combat skill to fight whol-
ly astral entities. Astrally projecting characters use their Mental
attributes in place of Physical ones (see the Astral Attributes
Table, above) along with the Astral Combat skill.

So to clarify, does this mean:

Astrally projecting characters use their Mental
attributes in place of Physical ones (and can only attack astral forms)

or does it mean

Astrally projecting characters use their Mental
attributes in place of Physical ones (even when attacking a non-astral mundane)