Not only does did they ruin all the aspects of "realism" by having him just waltz through the dungeon all cheery, now he'll exposed his "long lost art" for unimportant character #12.
people calling him a coward are dead retarded. he is just being realistic, imagine you were just thrown into another world, with no idea how to fight etc, do you really think you could survive in a dungeon with shit that wants to kill you? of course not, you dumbass.