They were passing by that frozen side when the ice broke where Luke was. You, Clementine and Bonnie were panicked when you all saw him standing on the cracked ice. Bonnie stepped closer which made things worse and you tried to convince her to step back, she didn't listen to you and Luke ended up falling through the ice and into the lake, without a second thought you dived in after him. The two of you made it out and sat in the snow by the edge of the lake to catch your breath.