With the Wall-Hack activated, Leo knew that there were no more monsters in the cave. The only monster there was the bear they killed, so they didn't have to worry about another monster suddenly appearing and attacking them.
Of course, they also didn't even know if there was any treasure in this bear's lair, so they were just going out of curiosity and a sense of adventure.
But before going, they had waited a while to recover and rest, as the battle with the bear was very tiring and both Dave and Charlie were badly injured.
None of their injuries were serious, but they accumulated a lot of minor injuries that they had to take in order to attack Bear.
While during the battle everyone was quite tired, the boy with the healing Quirk was very energetic, now it was the opposite, after he healed Dave and Charlie, both of them became quite energetic and the boy was very tired as this was the third time he healed the boys today.