AI pushing people away script

[Nemaconz]

Trying to get certain AI of mine to push people back if they get to close, but the script I wrote is not working, any script Gods here think they can lend a hand?

 

_playerpresent = (position _aiunit) nearEntities ["Man", _wpradius];

_aiunit spawn {
    while {alive _this} do
    {     
        _playerPresent = false;
        {if((isPlayer _x) && (_x distance _aiunit <= 20)) then {_playerPresent = true};}forEach playableUnits;
        while (_playerPresent) do {_x setVelocity [10,10,10];};
    };
  };