Rewatching episode 3, where Hal and Shadia show Thaisha around the Hallowed Round, and had some feelings about this. Like, this has clearly been a long, long conversation between these two. They must have had discussions and arguments about it for many years. Hell, I‘d bet Thaisha was the first person Hal ever told about this dream of his.
And now, after all those talks, they made it to opening night and their daughter is up on stage performing as a revolutionary. Their daughter, who they‘ve raised to honour her people and her history, to follow the Old Path and respect the Fair Folk. Thaisha - who Brennan refers to as high priestess of this ritual - is here to guide the dead down the Path. The play is the ritual and the paints built the bridge, but without a druid of the Old Path, the spirits would have nowhere to go. Thaisha is talking to and calming down the spirits while Hal does the same with his actors. Hal tricked the Creed to make this possible, and Thaisha heads up to confront the luxes to protect the ritual. All the time Hal put in researching, writing, rehearsing, building this space and his theatre company. All the time Thaisha spent travelling, fighting to heal barrowdells, giving rites to the dead and offering blessings to the living. All the time they both spent raising and teaching Shadia, who now works her own magic on the world. They spent so much of their lives apart, doing what they believe in. Sometimes it may have felt like they were on entirely different paths, but all of that helped bring them to this moment. Because they have the exact same calling in life.