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It is written [Shoftim 14: 5 – 6]: And Shimshon and his father and mother went down to Timnah, and they came to the vineyards of Timnah, and behold, a young lion roared towards him. And there rested on him a spirit of Hashem, and he rent it as one would rent a kid, although he had nothing in his hand, but he did not tell his father and mother what he had done.
The question is asked: How did his father and mother not see what he did? The verse explicitly states that he went together with them!?
The Vilna Gaon answers based upon our Gemora, which states that that we tell a nazir, “Go around and do not come near the vineyard,” for we are concerned that the nazir will eat from the grapes.
Accordingly, it can be said that when Shimshon, who was a nazir, came across the vineyard, he immediately separated from them in order not to stumble by the vineyard. It was at this time that he met up with the lion.