The jab step and jump turn are very similar. With the jab step, the pivot foot moves first toward 3rd, followed immediately by a step toward 1st with the free foot. With the jump turn, both feet move simultaneously, but generally wind up in the same place as the jab step.
Both moves are legal, but neither entails stepping off legally. F1 remains engaged (even if his pivot foot comes off the rubber) and he must throw to 1st.
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