You're all wrong, it's a super-fast-growing fungus peculiar to empty terra cotta pots. The woddy is known for being immune. They're just doing woody-styl tai chi.
Aah so this is how Woodies get to our planet - in highly ornate terra cotta spaceships . .
This is either still steaming because it has just arrived, after hurtling through the atmosphere . . or maybe it's steaming because after hurtling through the atmosphere in little more than a large plant pot one of the Woodies got nervous . . . and the other one is saying " yikes - get back in there and don't come out till the smell has gone !! "