"Yeah, sorry uh--hold that thought," This time she does switch the crystal off before talking to Matty, not sure if her idea is even feasible.
"Matty, if we get under the rift and it's another one of those ice bubbles like before, and you shot a big blast of fire directly upwards, would you be able to make the fire hot enough to blast the water out of the way? Or turn it to steam? Actually, now that I'm saying it out loud that seems stupid, nevermind." Back to the crystal: "It's probably best if you come down into the caves, then, let me know when you get to the opening so I can guide you along the path we took."
(feel free to time skip to after the walkthrough but don't feel pressured to do so etc etc etc)
"Matty, if we get under the rift and it's another one of those ice bubbles like before, and you shot a big blast of fire directly upwards, would you be able to make the fire hot enough to blast the water out of the way? Or turn it to steam? Actually, now that I'm saying it out loud that seems stupid, nevermind." Back to the crystal: "It's probably best if you come down into the caves, then, let me know when you get to the opening so I can guide you along the path we took."