Matoka's visions don't usually wait for convenient timing. When she was younger, she - just had to live with that. Later, she had friends around to handle things when she was incapacitated. Now, it's somewhat of a credit; having a vision during a sermon gives new clarity on matters to talk about.
Being in a boat during a storm isn't one of those convenient times. She thought she'd done the right rituals to ward off the witches (neé spirits), but perhaps she didn't or perhaps they didn't work. She knows her friends will be helping and that everything will be okay.
This vision comes with more to the senses and less direct knowledge than usual. She's in a strange room, on a soft thing. On the walls are shelves with other things. They don't look like tools or food and only scarcely like art; she could perhaps guess at what they are, though they'd just be guesses. She doesn't know what the things are, nor does she Know.
...It's a very soft surface. Perhaps that's what she was meant to learn here.