I'd like to report a player for using anti knockback when ever I hit him or shot him he wouldn't move he may be using a hack client that has other abilities.

 

Please provide proof, if no proof there will be no actions taking.

 

Without proof I cannot do anything.
I will keep an eye on him, but proof would be very helpful.

24 hours to provide valid evidence.

 

They'll never give proof anyways.

Archiving due to lack of evidence.