Green Flag Oak

I was in a big old house, comfortable, with a lot of varnished wood and leather furniture.
Several people were there as well but the owner seemed a gaunt old soldier, bit scary. The atmosphere in general was vaguely threatening.
I went upstairs and exited by a back door which led directly onto a green field sloping upwards. Another person was beside me.
Near the top of the field was a huge, ancient, oak tree. Around 100 feet up was a hollow part of the tree. Sticking out of the hollow was a tattered green flag. It looked like a wooden figure was also in the hollow, perhaps holding the flag.
Suddenly the figure jumped down from the tree and ran towards us.
It then became two, then four, finally five.
They were weird creatures, half human, half tree like. (Dryads?)
They spoke to us a lot (don't remember what).
One ran off (the original one?) into the house. I told the others it was dangerous in the house and I would go and get him (her?) back.
One said not to bother as he would use the Dyrac (or Dirac) technique to get him back. He spoke into his hand and the adventurer suddenly reappeared alongside us.
I was quite intrigued by the whole episode but then woke up.