Bickering
Michael's train of thought was pretty simple.
Since the deadly fog that drained everyone's lifeforce was connected to the death swirl in the Skeleton's chest, cleansing the deadly fog would force Raven to release more energy to keep the entire camp shrouded.
MIchael had no idea what Raven's plan was but given the little intel at his disposal, he figured that Raven had been ordered to kill as many Descendants as possible. Was that a punishment for allowing the Tritan Alliance to come to existence? Michael had no idea. All he knew was that the Skeleton focused on the deadly fog while clashing with Killian.
'Once the death energy swirl is drained, the Skeleton should collapse. It's 'kept alive' by the energy swirl, after all.' Michael concluded. The only downside was that the death energy swirl was overflowing with a tremendous amount of energy. It possessed more energy than ten thousand Inferior Energy Stones. That was bad.