After he entered the snowy place and was bout to cross the bridge, a dark long neck shadow came through wanting to shake his hand. So he did but then there was the prank. Because of this, sousaphone simon was doing that prank to trick a human. Noticing that he had to hide behind.

After deltoid Donny came into the scene because he didn't like simon's puns. But they left.

After revealing himself that they were gone. His journey continues through the snowdin. Encounters Deltoid Donny.

After going through the special blue attack, he(Leaky Louie) is blue now.

After that special attack, deltoid Donny was spared. So the journey continues.