This is yet another reason why I generally just stay away from PvP. First came the Lag Switchers. Now Level 0 invisible unlimited heavy Jerks. Eh, screw it I'll just go play more W3.
*edit* this is not me playing I found this on youtube
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You deserve it for running around an open map with a shotgun you nob. Try use a weapon that require you running right up to their face to hit them