Papyrus ran to a private area and enacted Sans code spaghetti. "Hello Undyne. Two human soldiers are in Snowdin." "Two humans, what!?" Undyne screamed. Papyrus could hear her armor clattering. "Yes, they haven't killed anyone. They're with Sans.
He's keeping them busy. One has a gun and another has a machete. They have full armor. I'm going to evacuate Snowdin in case more come."
Papyrus was gathering people and warning them. They went to the true lab. Alphys was happy to let people hide there.
After evacuation, there was something he needed to do. Make sure the monsters were safe. Papyrus was in the area between Snowdin and Waterfall. "Humans." Both humans looked at him and Sans was sweating, while watching behind the scenes. "I, the Great Papyrus, wish to test our skills and spar."
"Are you stupid?" Omori asked. "I don't want to spar you. I don't want to be captured by you. And if you dare touch Frisk, I'll kill you. Word be damned. Leave."
Papyrus stood up, "Humans, I can't let you pass." Omori caught Sans worried glimpse and pretended Papyrus was Frisk.
So he settled for a compromise by pushing Papyrus into the snow, before walking around him. Sans wasn't sure how he felt about this solution.