Due to narrative convenience, this happened to be a day when Tom was in the school. Lacking any classes, it seemed like a good thing to check out.
He pulled his phone free, and quickly sent a text message to the team to inform them of the light, and the fact that he's there and checking it out.
After that, he stepped forward extending a hand toward the light wondering if it would also feel like the paradise decay he had touched back in Aomori's dungeon.