What is the most logical next event?

We see men climbing indoors on a climbing wall, and outdoors in the woods. We see two men outdoors at night then day. We see men climbing a cliff. a man

pick from the following. [I] waves from the top.; [II] slams into a slanted rock wall and then lays down.; [III] falls back to the ground.; [IV] in a suit stands, holds his arms out, and pictures and discs.;
[I]