You can use various items for a reach rescue. The most important thing to remember is your safety and the safety of the person you are helping:
Examples:
a pole
a pool noodle
a flutter board
a lifejacket or PFD
a tree limb
Be creative! What is around you that can work.
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Have as much of you body in contact with the ground as possible. That means lie down. Also, the victim, if panicking, may pull you in very hard. Also, Get help.