I believe it's this one:
The Tree bleeding IMHO could just be a metaphor, as for the "ripple through the realm for ages" and the fabric statement could be a reference to the Realm Tear in the room, though given Sigrun exists, I think both might be a side effect of the Valkyries, but I guess we'll have to wait and see until next month.
Basically, Sigrun tried imprisoning either Gunnr or Hildr in the first room outside their home, but a thief got in and mucked that all up and accidentally freed the Valkyrie and paid the ultimate price for it: HIS LIFE.