With the distribution of crystal hearts done, everyone went ahead to do their own things.
Malachi had used his ability to check his surroundings several times and confirmed that there should be no danger around them at the moment. It was because of this that he was able to somewhat relax.
David and Leo did not know this, so even if they were doing their own things, a major part of their attention was still on their surroundings every once in a while.
Malachi saw this and saw no reason to stop them. It was better this way. Though he was sure there was no danger around, a little vigilance wasn't bad.
Soon, Malachi started to absorb the crystal hearts he had gathered. He still remained seated on the ground while he did this.
It wasn't that he couldn't stand up to go somewhere else; the sense of weakness he felt hadn't reached that level, he just didn't see the reason to as he was already comfortable in his position.