Help request about Athena events in Guild base

Dear all,

Today I went to my guild, and found 3 quests to complete.
1) It was about killing 2 specters and a 50 minions - Done easily
2) This one we needed to kill one of the 3 judges - I had to look for it, but I could find a judge and explained him clearly that he was not welcome.
3) Have a problem here...

First let's have a look at the screenshot embedded.
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It show the guild base, the mission seems to be to kill the Minion with the exclamation point (i.e. selected in the picture), except that he is considered as an ally, so I cannot hit him.
I checked the short instructions, that begin with "击杀" - which seems to mean kill - and the name of the guy.
After some tries I could realize that under some unclear circumstances, like an attack of some sort from a NPC he could reveal he is a disguised specter... but even in that form, he is still considered as ally. So I cannot touch him.

Thanks Picollo ! :-)

Anyway, I am thinking if you could not rename the subject of the other post, because in my humble opinion, not sure it is nor helpful, neither informative title.