In Jurassic Park (1993) when the T-Rex breaks free from the cage, the two kids are alone in the car.
The T-Rex is interested in the Grant/Malcolm car, but Lex turns on a flashlight and attracts the T-Rex.
Why does she turn on the flashlight?
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She has no intent...she's just looking for anything as the script makes clear..
Lex is rummaging around in the back cargo area, looking for something, anything. She finds a flashlight.
Because that's what you do with a flashlight and she doesn't know any different or that it will attract the T-Rex.
I'm sorry - - I'm sorry - -
Turn it off, Lex! Turn it off!
Tim climbs over the seat and joins Lex.
Where is the button then?
I don't know, I don't know. I'm sorry - -
Why did you do this?
I don't know! I'm sorry!
They are kids and Gennaro has left them alone in the car. They didn't know what to do.
So they looked for a way to call for help from Grant or Melcom. You can also hear Lex calling Dr. Grant's name in a low voice due to fear. So, they used the flashlight to signal them but she didn't know that it would attract the T-Rex.