Exasperation
Instinctively, the first thing Jake had in mind was rushing to the stone house ruins in search of survivors. But when he found the extent of the carnage, he took a step back. The only way his companions could have survived was to have fled or been left for dead. Otherwise, they would still be fighting.
As mighty as Jake may be, he had no effective way to put out the wildfire. Theoretically, he should have been able to create a vacuum zone with his telekinesis to deprive the flames of oxygen or absorb their heat with his own body, but the latter ability was passive. He didn't have much control over it.
As for his telekinesis, his control over a fire of this magnitude was far from absolute. He could only hope that it would rain or that the fire would stop on its own. With the recent drop in temperature it was not impossible.
On top of that, he was still injured. He was really hoping that no monsters were still lurking around or he might spend a nasty night.