The expression on Vinny's face took a sudden change as all the colors were drained from it. Even her lips paled and her hands were shaking. This was the first time Lloyd and the rest of the party saw Vinny react to an enemy like that. Usually, even if the enemy was close to impossible to defeat, Vinny would always remain calm and collected, telling them all the information she knows about the enemy as per her Clairvoyance Skill.
From the looks of it, Vinny saw something just by the end of the Ice Cave, and whatever it was, they cannot defeat it. However, how could they possibly get out of the Gate if they couldn't defeat whatever it was that resides there? Besides, the Gate that leads to this place disappeared right when all of them got in. There was no way out, and the monster/entity at the end of the Ice Cave could just come up to them and slaughter them at any moment.