Popo was smacking ice blocks back to Nana with his wooden mallet, with the Ice Climber girl doing the same thing with her hammer to her fellow parka robed Eskimo, with them trying to see how long could they volley back the same ice block, being at the top of the snowy summit they had just finished climbing up over time.
"Hey sis, you think there's more to life than everything being repetitive?"
"Good question bro, it feels like everything we do is repeating stuff we've already covered!"
"Maybe it's the story's way of saying we don't have to go so far with our climbing..."
"...Oh don't fret over that, there's plenty of ice we've yet to smash!"
And with that the Ice Climbers focused more on their volleying game, with their hammers starting to get icy splinters on them from whacking too harshly into the block of ice that got chipped from getting hit so much.