As You were Walking Through UnderFell You can See Everyone Hiding from the Last Time, It seems that Cross Was Here After all he left his Marks everywhere..

"Tch.. Everyone here is a bunch of Pussy's for Hiding Like Cowards..! Haha!"

When You Heard Those Unnecessary Words you look up in front of you and you see.. Fell? He must be making fun of everyone in Snowdin for hiding...