In most MMORPGs, illusion magics in lower levels do just distract and confuse enemies. However, on higher levels of mastery the spell user can create phantasms that appear tangible due to the illusion magics dominating the enemies mind making it appear so real to the target because all his senses are in control by the illusionist. What's that saying in the Matrix again? The body can't live with the mind?
What Kirito did might just reflect his high level stats appearing in his illusion magic.
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