What happens will depend on whether it is a waterproof flashlight.
Most sources of water are electric conductors, containing enough dissolved salts (even tap water) to conduct electricity. As a result, any electrical appliance, including a flashlight, can be shorted out if put in water. Being in water when an appliance falls into that water and shorts out can be dangerous:
blood is a better conductor even than tap water, and the electric current can use our bodies to conduct through.
The electronics in a flashlight, however, is surrounded by a casing, which is not connected to the wiring. Even if the circuits are still dangerous, the casing is not, and it would be safe to pick up.If the casing is water-tight, then water cannot get inside the flashlight where the circuits are. Not only will it be safe to pick up, but it will still work.
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