Why is Kirito paralyzed?

Why is Kirito paralyzed? But something went wrong as at the same time, Rath was being raided by mercenaries. This resulted in some kind of explosion, which reduced Kirito to this new state (and still without his right arm).

But something went wrong as at the same time, Rath was being raided by mercenaries. This resulted in some kind of explosion, which reduced Kirito to this new state (and still without his right arm).
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