How did the grandpa in Spy Kids lost his legs?

How did the grandpa in Spy Kids lost his legs? Past. Over 30 years before the events of the Spy Kids films, Valentin was an agent of the OSS alongside his comrade, Sebastian. One day however, before Sebastian was sent to the virtual world, he injured Valentin to a point of placing him in a wheelchair.

Past. Over 30 years before the events of the Spy Kids films, Valentin was an agent of the OSS alongside his comrade, Sebastian. One day however, before Sebastian was sent to the virtual world, he injured Valentin to a point of placing him in a wheelchair.
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