Why is expose considered an attack?

Cheecton

Under an Ackbar lead, BB8's illuminated destiny does not call an assist. WAI?

Old_Man_Jenkins

Yeah. Other things that apply debuffs and do not trigger AAs leader ability include but is not limited to Tarkins offense crit down debuff and Old Bens ability block offense down debuff.

Kyno

Moved to strategy section.

Yeah, WAI for now. As stated above there is a little inconsistency here but expose seems to be an "attack". Kinda makes sense as it will cause damage, just not directly.