@Kampfarsch
Lyohzeed is right, adding the word
even does change the meaning. For example: "how in the world is he swimming at X speed when humans can't
even swim faster than 10 km/h???!!!"
Here is the translation from page 5 but with the word even added in:
"What? I can't shake the feeling that something passed by me with incredible speed...but that's ridiculous. Humans can't
even swim 10 km per hour. I must have imagined it. That's all..."
It's very likely that there was either a translation error or a typo by the author/translation team.