Despite the injuries, the adventures that Walker had just pulled from the water elemental plane were just fine. They could be healed easily while they were also very clearly understanding the errors of what they had just done.
The taking part was that they hadn't even managed to see a single material that they could bring back of value. Meaning they had gone just to be beaten up. Just so that they could understand that they were not even close enough in strength to survive a few moments within any elemental plane.
While an argument could be made that they would have done better if they were on the outskirts in the weaker areas of the water elemental plane, there was still the fact that they would have struggled in the water. The water elemental planes were unique and hard to move through in general.
