Memory 02. In this memory, he's in a forest, fighting the same master/servant duo in Memory 01. However, this time, we get a clearer idea of what his fighting style is.
He's got a "Noble Phantasm" that lets him be camouflaged completely, including the arrows he shoots off, and he does this as he fights his opponents. He also uses poison! He talks about how the opponent master is a lot like him.
Pessimistic. Has no desire for the grail. Has no desire achieving anything at all. You want to run away.
He's being called a coward for his style of fighting, and it doesn't seem like something he argues with.
Despite that, the way he fights seems to prove that it gives him an upper hand. In fact, it looks like he's about to win but something causes his arrows to explode, revealing his face, and he runs off.