It says in sefer Shoftim (14,5-6) "And Shimshon and his father and mother went down to Timnas, and they came until the vineyards of Timnas, and behold, a young lion roared towards him. And there rested upon him the spirit of Hashem, and he tore it apart as one would tear apart a kid, and he had nothing in his hand, but he did not tell his father and mother what he had done".

It says clearly that Shimshon (Samson) went together with his father and mother, so why did they not see what happened? And why does it not say "a young lion roared towards them?