Rare mob invincible/un-hittable

As the title says, as i was doing a stone citadel, i came across this rare archer mob that shoots with his feet and i couldn't hit him...

I have no idea if they had an evasion too high or anything, the health bar wouldn't show up.

I will put below a clip made with MedalTV so that you can watch it :

https://medal.tv/games/path-of-exile-2/clips/jvIpKRnJQX8nWb1H7?invite=cr-MSxDcXMsMjA3NDA2NzY4LA


Please fix !