How my rex died

I make stupid mistakes in my life. but perhaps this is my dumbest one yet. I had a Rex named Charlie and I went to go take a new sarco. so once I tamed it. Charlie was following me. and because I’m so freaking forgetful. I went into the water with my sarco,and then I forgot Charlie was following me and she was in the water to. she’s getting attacked by jellyfish and I think a Megalodon and I was trying to use my Sarco to save her but it almost died.and at that point all three of us would’ve died probably. so I tried to get Charlie out the water but I couldn’t and she sadly died. I did tame a new Rex but rip Charlie. and I vow to try and beat extinction by only using Rex’s.