I was playing an infection lobby on modern warfare 3 and went to throw my knife when i got infected and went near a person and I flew half way across the map and I have the video on my online vault to prove it
By "Infection Lobby", are you referring to the Infection gametype, or the Hacked lobby?
Either way, I would suggest you report the player using the In-Game MW3 Reporting feature, and File a Complaint via the Xbox Live profile.
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