Magic Portal that completes a Cloister

[MeepMoop]

In a recent game I played a magic portal tile next to an unoccupied cloister and deployed my follower to the cloister.  Playing the magic portal tile completed the cloister.  My opponent thought that I couldn't play into the cloister since it was completed by the magic portal tile.   Conversely, I believed that the cloister wasn't "completed" until after I deployed the follower.  My opponent made a fuss and I rescinded my move to avoid argument.

Thoughts?  Was the cloister still incomplete and thus legal to play into even though the magic portal tile ended up completed it?

[CKorfmann]

It is a matter of turn order.  In this instance, simply... place a tile, place a follower (or other), score for completed features, remove followers/others.  You are correct.  I doubt they'd have the same argument for incomplete cities.  With the portal, it's the same principle.

[MeepMoop]

Thanks, I was reasoning along those lines.