I'm preparing for sleep... Yesterday night I had a very weird dream that I can only share with you here

So I was in the sea with shifu no1. He's my main shifu, teacher, for the past year.
We were in the sea. He doesn't know how to swim but we were deeped into the sea and huge waves were passing. I hold onto him strongly and telling him not to worry and that we'll be okay.
The waters were bright and clear, light blue and beautiful.
The waves stopped and I turned to see him but he was immobile.. he'd died. It was very quiet and the sea too, no waves sounds. Just sun and water. I woke up and made up another scenario in my fantasy where he wasn't dead. But in the dream he died.