While I was taking a few more photos of the quilt before sending it
this was going on directly below me!
The stand-off lasted about half an hour of Shadow barking and the possum hissing after I gave up trying to coax him out with treats (even chocolate didn't work!) while I fed Eleanor. Eventually I pushed Shadow away with long broom, which gave the possum the chance to run off and up a tree to safety. Neither seem injured!