Trading Places

When a man is seen drifting in the ocean, Matt and Stephanie are called in to rescue him. But as they are approaching the victim, a Coast Guard helicopter waves them away from the victim, and they rescue him instead. Later Stephanie and Matt confront one of the Coast Guard members Scott Daniels about calling the scarab off. Scott explains to them that they couldn't see it, but the scarab was about to travel across a fish net, which would have folded the scarab propellers.
At first Stephanie doesn't like Scott, and she is less than thrilled when she discovers that she will work with him on the beach for a day because Chief Thorpe thinks it will be a good thing for the Coast Guard to see what a lifeguard does and the other way around. Scott is convinced that life-guarding is all about working on your tan, but when Stephanie is forced to make a rescue and Scott doesn't have a clue who the victims are, he agrees that life-guarding is a very serious job and that you have to be on your guard

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S04E22 - Guys & Dolls