Usagi Yojimbo, Vol. 4 #31A

With the Komori (Bat) Ninja Clan behind them, Usagi, Yukichi, and Chizu flee over the snow-covered pass. They have to cross a frozen lake, but their position in the open on such a slippery surface makes them easy prey for the bats-and the ice is not completely frozen! Also, Yukichi learns a valuable lesson: you can't trust a ninja.