dreamt by a friend of mine

Hi, this night I appeared in a dream of a friend of mine I haven't seen for more than a couple of months and he texted me.

We were at his grandmother's house and he left some playing cards outside, there was the sea despite the city isn't directly on the sea. He noticed some waterspout forming and warned me, he came into the house but I stayed out there. The water went into the house and after a while it ended, he tought I was dead but after a while I came to the surface again live and he lifted me up.
The thing that struck him more is the presence of the sea where there isn't. Yesterday he saw a waterspout, a video with water and he knew he had to go to his grandmother.

What can this dream mean for me and him in your opinion ?

Thanks

Can anyone help ?

In my opinion, your friends dream represented his subconscious letting him know that, in spite of internal emotions that might be overwhelming him, everything will be okay.