Aether Walk is the Lvl 7 Skill of the Ghostslayer Bloodhunter and stated as follows:
Upon reaching 7th level, at the start of your turn, you can magically step into the veil between the planes as long as you aren’t incapacitated. You can move through other creatures and objects as if they were difficult terrain, as well as see and affect creatures and objects on the Ethereal Plane. You take 1d10 force damage if you end your turn inside an object.
Considering this question, would an opportunity attack even be able to hit the aether walking character he isn't on the ethereal plane, but in between?
Since to me this seems to be a hard take on letting the DM decide, how would you rule this scenario?