To even start doing anything in this room you need to be sble to get around the gentryii. The wubba that starts to its East is the only thing in the room that can enter its space.
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×You need it to be an obstacle to safely step around. Personally I pull it North over the crumbly wall, then drag the gentryii South and with sword facing E, move north again so I can step NE past the gentryii and have it get caught on the wubba. Once past the gentryii it should be easy to free it.
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×To block the wubba with the gentryii, I lead it clockwise around the greenhouse. This will let me turn my sword to get one tile separation, then you can lead it into the corridor when moving South and stepping SE below the Southern corridor entrance. Then you can lead then gentryii into position from outside the corridor, and the wubba will still be behind the red door having only moved twice.
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×Having the wubba move twice also means that when you close the red door, the gentryii will have its head on the red door, not its chain, so it wont be trapped and you can lead it North out of the corridor in the other direction.
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×If you want to then park the gentryii somewhere out of the way, the wubba at the South starts the room in a nice position to stick the gentryii behind.