why not?

So, they are fighting trying to do whatever on Lyoko and Odd with his usual antics gets devirtualized. Why can't he simply stay in the scammer, have Jeremy scan him again, and REvirtualize him onto Lyoko to keep fighting?

[Ulrich_Stern506]

It's not at all possible, because their cells would degenerate if so, because the human nervous system takes time to do anything; That's why the 12 hours before re-virtualization is in effect, the supercomputer will not allow it.