Sorry if this has been asked before, I couldn't locate it.
Anyway, does the Attacking Pokemon lose 50% of its HP or does it lose 2 Attack stages?
Thanks in advance,
King's Shield only lowers attack of attackers making contact. Where she went wrong was that Aegislash is naturally immune to high jump kick, so it did not make contact. AegiDash was correct. It loses both HP and attack.
Source: Dis Showdown Test