[The sound of a blade entering someone's body is something that Shirou is a bit familiar with, considering his countless experiences with them during the Grail War.
The face of his father in pain, though, was an alien concept, especially considering that it came from a bladed weapon and not his odd moments of sickness when he was young. Shirou, for the first time in his life as well, also realized that this is the first time he had ever seen his father sacrifice his own body to protect him.
Thus, when Kiritsugu turned to face his unknown assailant, Shirou figured out that he's currently sitting on the ground, where it's clear that he fell on his behind upon seeing his wounded father.]
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The face of his father in pain, though, was an alien concept, especially considering that it came from a bladed weapon and not his odd moments of sickness when he was young. Shirou, for the first time in his life as well, also realized that this is the first time he had ever seen his father sacrifice his own body to protect him.
Thus, when Kiritsugu turned to face his unknown assailant, Shirou figured out that he's currently sitting on the ground, where it's clear that he fell on his behind upon seeing his wounded father.]