If anyone in your group is having trouble seeing the icon or hearing the sound effect, try putting Twintania on focus target. I'm not sure how to do it on PS4, but I know it's possible. When Twin flies up at the start of phase 3, the focus target will vanish, but when she comes back down for Divebomb, the focus target will reappear (and immediately show Divebomb's cast bar). Use the reappearance of the focus target UI to gauge when to move. This is extremely helpful for me personally on the second set of Divebombs once the snakes are in our faces.

It helps to have Twin focus targeted for Twisters anyway, which will happen in the next phase. Best of luck!