Gale noticed Swan had fallen asleep, which relieved him, as he didn't want his mate to suffer through the cold night.
With a cold blanket and constant bonfire, she should be able to sleep through the night safely.
He stared at the bonfire for a while, then lifted his head slightly to stare at the blood moon. He purposely didn't give Swan an answer to her question about the red moon, because he knew it would make her worry excessively about his well-being.
The blood moon only happened during the coldest winter night, usually around late December, and it was the sign for him—The Cursed Wolf—to fulfill his duty.
Whenever the blood moon was hanging on the sky clearly, he would feel a burning sensation all around his body. His heartbeat would accelerate until he felt that it could burst out of his chest anytime.