How does the character Chris Hughes from the novel Timeline change from the beginning of the story to the end?

Chris Hughes is a student of Professor Johnston. Chris’s specialty at the archeological site at Dordogne is the mill. Chris is trying to figure out if the mill was fortified or not, something that was fairly new at the time. When Johnston disappears and Marek asks Chris to be part of the team that rescues him, Chris jumps at the chance.

Chris is something of a weakling who often finds himself getting in difficult situations, usually over women. When he goes to the past, he finds himself lying to a pretty girl to impress her, a lie that causes him to end up having to joust with her potential husband. As time passes, however, Chris proves himself to be much braver than he appears. In fact, Chris single handedly kills de Kere, the one man crazy enough to kill them all.