Predicting the Friends' Actions During a Storm

During a particularly hot summer, a group of friends decided to take a trip to the local lake. They planned to spend the entire day swimming, playing games, and having a picnic. Just as they arrived and set up their spot, they noticed dark clouds forming in the sky. One friend, Mark, suggested they check the weather online. The forecast warned of a possible thunderstorm in the late afternoon. Although the group was excited, they started to feel anxious about the potential storm ruining their day. Mark proposed they enjoy their time but keep an eye on the sky and be ready to leave if the storm approached.

After a few hours of fun, the clouds grew darker and a rumble of thunder echoed in the distance. The friends debated whether to stay or find shelter. Some were hopeful the storm would pass quickly, while others worried it might be dangerous. They knew that if they continued swimming without a plan, they might face an unexpected downpour.

What is the most likely action the friends will take next?