This guy used to be an adventurer like you, but then he took an Стрела to the knee. It's an Internet joke that MUST. GO. AWAAAY. Combustible лимон to the knee jokes, however... Here's an example of an Стрела to the knee joke:
I used to be a Shugo Chara obsessed idiot, but then I took an Стрела to the knee.