The Activity Club and the Ice Dungeon Challenge

Let's go!

Isabel hops in, and the rest of the gang follows. The door slams shut behind them, and the four walk down the staircase, with Isabel in front, then Ed, Isaac, and Max at the back. All have their weapons poised - Isabel with her umbrella, Ed with his paintbrush, Max with his baseball bat, and Isaac, who keeps his hands in front of him, ready to conjure some lightning.

They reach the wooden door. Whose suggestion should they take to open the door?