I very rarely remember my dreams but this one was very vivid and stayed with me. Any thoughts on what it could mean?

It took place at the home my aunt and uncle had when I was a kid. It was on a lake and they always had the best father's day cookouts. 

A bunch of people from my gym were there, along with people I knew in my dream (but don't know in real life).

We were all in the water having a nice time. There was a young child that had one of those kiddy leashes connected to him (no clue why haha) that was swimming from one parent to another, and I remember being really worried that the leash was dragging across the bottom of the lake even though we were in shallow water. As I went down to grab it my hair got wet, and that seemed important in my dream for some reason. As I stood up, this huge orca breached out of the water and made this huge splash as it landed on the surface of the water.

My first thought was "how is there a whale in here?" Then all of the sudden it started swimming our way extremely fast. My voice was calm as I was telling everyone to get out of the water, but I was really scared. It was like I was hearing someone else saying it calmly. 

There was a man a little bit away from me near some cattails, that wasn't going to make it if he tried to get to shore, so I stopped for a second, trying to figure out a way to help him, but that whale was getting so close that I wasn't going to make it either. There was also a kid in my arms. I didn't see his face but he was around 8-10 years old. He never said a word - he just clung to me. The orca passed the man and came directly at us, and I knew we had to stay still so I just froze. It came within inches and as it got that close I realized it was this orca-shaped boat and it just zoomed past us. When I woke up I sitting straight up in bed I was so scared..haha! It was so weird because when it breached it was a real whale. Any thoughts on what that could mean??